Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CHEMISTRY > UNIT#03 GASES > Flashcards

UNIT#03 GASES Flashcards

You may prefer our related Brainscape-certified flashcards:
Periodic Table flashcards Chemistry 101 flashcards AP® Chemistry flashcards Organic Chemistry 101 flashcards
1
Q

At constant temperature when the pressure of a gas is increased three times then its volume becomes:

A

V/3
(P ∝ 1/V)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Under what conditions the density of an ideal gas will be maximum at:

A

➡Low temperature
➡High Pressure
(d= PV/RT)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

If 1/V is plotted on x-axis and pressure on Y-axis at constant temperature, what should appear:

A

Straight line passing thorugh origin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The general gas equation to know the volumes of the gas at various temperatures is:

A

Vt = V° (1+t/273)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

A mono-atomic substance can store energy only in the form of:

A

Translational Motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

A graph between pressure and product of pressure and volume at constant temperature and number of moles is:

A

Straight line parallel to x-axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

If both temperature and volme of a gas are doubled, the pressure

A

Remain unchanged

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

WHich one is the form of general gas equation:

A

➡PV=nRT
➡PV=RT
➡P1V1/T1 = P2V2/T2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Volume of a gas at S.T.P is 10dm3 at what temperature its volume will become 30dm3, keeping pressure constant

A

819K
(V1T1 = V2T2)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which of the follwoing pairs of gases possess equal volume at S.T.P

A

0.5 mole of NO and 16g of O2
(Equal volume of all ideal gas at same temperature and pressure contain equal number of molecules and moles)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Which is incorrect about ideal gas

A

➡No force of attraction between molecules❌
➡No example in nature❌
➡Can be liquified easily✅
➡Obey gas laws at all conditions of temperature and pressure❌

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

A gas initially at 27 °C is heated up to 327 °C, its average kinetic energy will be:

A

Double

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The coorect value for geenral gas constant is:

A

8.314 x 10^7 erg mol-1 K-1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In gases and liquids, temperature is the measure of _____ kinetic energies of molecules.

A

Average translational

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The molar volume of nitrogen gas is maximum at:

A

130 °C and 1 atm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

8g of methane and 2g of hydrogen are mixed and kept at 760 mm pressure at 273K, the total volume occupied by the mixture will be:

A

33.6 dm3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is NOT true about gases:

A

➡They are highly compressible❌
➡They have only vibrational motion✅
➡Sudden expansion of gases cause cooling❌
➡They exert pressure on the walls of the vessel❌

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

For a definite mass of ideal gas at constant temperature, the plot of which pair of species will give a curved graph.

A

P vs V

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

A pressure of 0.101325 bar when expressed in atmosphere represents:

A

0.1 atm
(1 atm = 1.10325 bar)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Dimensons of the pressure are the same as that of:

A

Force per unit volume

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Gases deviate from ideal behaviour at high pressure. Which of the following is correct for non-ideality?

A

At high pressure, the volume of the gas becomes insignificant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Under high pressure which of the following gas show more ideality in character:

A

N2
Ideality of gas will be more:
➡Less Intermolcular Force
➡Smaller Size
➡Non-Polar
➡Smaller mass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

When 200cm3 of a gas at constant pressure is heated, its volume:

A

Increases
(V ∝ T)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

The product of PV of a gas has unit of:

A

Work
(Joule)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

Under what condition if temperature and pressure will a real gas behave most like an ideal gas?

A

➡High Temperature
➡Low Pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Absolute temperature of a gas is direclty proportional to average ___.

A

Translational Kinetic Energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

An ideal gas cant be liquefied because:

A

Forces between its molecuels are negligible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

The compressibility factor ‘Z’ for an ideal gas is:

A

Equal to one

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

In dm3 atm K-1 mol-1, 2.0 g of hydrogen gas is heated from 27 °C to 327 °C. Which of the following is incorrect

A

The number of moles of the gas increases
(closed container)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

A pressure of a gas is due to:

A

Molecular impacts against the walls of vessel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

The compressiiblity actor, Z i.e the extent to which a real gas deviated from ideal behaviour is given by:

A

Z= PV/RT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Which of the following gases has the lowest r.m.s velocity at 25 °C

A

Cl2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Value of a ideal gas constant R does not depend upon:

A

Units of Temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

“a” is called co-efficient of attraction in Van der Waal’s equation for real gases the unit of “a” is:

A

Nm+4/mol2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

What will be the new volume if temperature and pressure both are reduced to half

A

Remains same

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

Very small values of Van der Waal’s constant in his equation for a particular gas shows that:

A

Least attractive forces are present among the molecules of the gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

Excluded volume is ____ times the actual volume of gas molecules

A

Four
(b=4Vm)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

The constant ‘a’ in Van Der Waal’s equation is maximum for:
(a=attraction per unit volume)

A

Ammonia
(Ammonia has hydrogen bonding, Strong intermolecular force)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

The average kinetic energy of the gas molecules is:

A

Directly proprotional to its absolute temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

All the collisions between the particles o gases are elastic in nature. What is meant by “elastic collision”

A

No change in the kinetic energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

Which one of the following expression represent the Avogadro law?

A

V=RnT/P
(When T and P are constant)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

The root mean square velocity of gases is inversely proportional to square root of their:

A

Molar mass
c (r.m.s) = √3RT/M

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

The number of molecules in 22.4 dm3 of H2 gas at 0 °C and 1 atm are:

A

6.02 x 10^23

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

There are four gases H2, N2, He, and CO2 at 0°C. Which gas shown greater non-ideal.

A

CO2
(Mass ∝ Intermolecular Force ∝ Non-Ideal Behaviour)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

Identify the value of R at STP:

A

0.0821 atm dm3 K-1 mole-1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

In the Van Der Waals equation, “b” represents that:

A

Excluded volume per mole

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

Gas is enclosed in a container of 20cm3 with the moving piston. According to kinetic theory o gases, what is the effect on freely moving molecules of the gas if temperature is increased from 20°C to 100°C?

A

Volume will be increased
(At constant pressure, by increasing temperature volume of a gas molecules)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

Which of the following is the correct equation to calculate relative molecular mass of a gas:

A

M = mRT/PV

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

Which of the statmeent is applicable for both ideal and real gases molecules?

A

➡Have no forces of attraction❌
➡Collisions between the molecules is elastic❌
➡Molecules are in random motion✅
➡The actual volume of gas is negligible as compared to the volume of the gas❌

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

At absolute zero the molecules of hydrogen gas will have:

A

All the motion are ceased

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

According to the general gas euation, density of an ideal gas depends upon:

A

➡Pressure
➡Temperature
➡Molar mass of the gas
➡All of the above✅

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

The actual volume of gas molecules is considered neglegibile at following pressures.

A

2 atm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

The unit is ___ commonly used by meterologist

A

Millibar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

Plasma is difficult to maintain at:

A

Low Temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

Effusion is the movement of a gas through extremely small opening of molecular size into region of ____ pressure.

A

Low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

PV/nRT for an ideal gas is called

A

Compressibility Factor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

The sum of moel fraction of the gases in a mixture of gases is:

A

Always 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

According to Avogadro’s law, .889 g of 1dm3 H2 and 1.4384g of 1 dm3 O2 have number of molecules

A

Same

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

Calculate the mass of 1dm3 of NH3 gas at 3°C and 1mm Hg pressure, considering that NH3 is ideally behaving

A

0.99 g

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
60
Q

212-degree Farhenheit is expressed Kelvin as:

A

373

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
61
Q

For non-ideal gas:

A

PV/NRT is not equal to Z

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
62
Q

R does not depend upon:

A

Pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
63
Q

Which law is applicable while respiration:

A

Dalton’s Law

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
64
Q

Which has the highest rate of diffusion:

A

NH3SO2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
65
Q

Effusions are:

A

Inversely to the square root of mass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
66
Q

KMT is discovered by:

A

Bernoulli

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
67
Q

Which of these gases cannot liquify:

A

➡H2
➡He

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
68
Q

The general gas equation is also known as:

A

Ideal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
69
Q

When temperature increases, the isotherm moves:

A

Away from both axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
70
Q

Volume in an ideal gas is directly related to;

A

➡n
➡T
➡P

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
71
Q

According to kinetic molecular theory absolute temperature is directly proportional to ___ of molecules.

A

Average translational kinetic Energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
72
Q

Calculate the density of methane in g/L at -450°C and 300 torr pressure.

A

0.338

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
73
Q

The general gas equation is also known as;

A

Ideal gas equation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
74
Q

The general gas equation is used for;

A

Ideal gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
75
Q

General Gas Equation

A

PV=nRT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
76
Q

Liquids have no definite shape it is because

A

The molecules of liquid are in constant motion by sliding over each other

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
77
Q

A class of materials with highly variable mechanical and optical properties that solidify from the molten state without crystallization are called

A

Amorphous solids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
78
Q

Gases deviate from Ideal behaviour at high pressure. Which of the following is correct for non idealty

A

At high pressure, the intermolecular attractions become significant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
79
Q

Under high pressure which of the following gas show more ideality in character
N2
CO2
NH3
SO2

A

N2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
80
Q

Absolute zero is

A

-459.67°F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
81
Q

The correct value of general gas constant is

A

8.314×10⁷ erg/mol.K

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
82
Q

An ideal gas can’t be liquefied because

A

Forces between its molecules are negligible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
83
Q

A fire extinguisher delivers 2.2 kg of CO2. volume of CO2 at STP is

A

1120 dm3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
84
Q

When 200 ml of a gas at constant pressure is hated its volume

A

Increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
85
Q

The product of PV of a gas is a unit of

A

Work

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
86
Q

Gases exert pressure on the walls of the container because the gas molecules

A

Collide with walls of container

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
87
Q

Which one of the following is absolute zero

A

Zero kelvin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
88
Q

The number of molecules in 0.0112m3 of Methane at 0°C and pressure of 760 mm Hg is

A

3.01×10^23

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
89
Q

Which of the following will have same number of molecules at STP

A

280 cm3 of CO2 and 280 cm3 of N2O

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
90
Q

The graph between pressure and inverse of volume at constant pressure and number of moles

A

Straight line passing through the origin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
91
Q

In a closed vessel of 1000 cm3, H2 gas is heated from 27°C to 127°C. Which statement is not correct

A

The number of moles of gas increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
92
Q

The molecules of gas show more deviation from Ideal behaviour at low temperature because

A

Attractive force dominate at low temperature

93
Q

The gas was our best applicable under the condition

A

Low pressure and high temperature

94
Q

The root mean square velocity is expressed as

A

(3RT/M)½

95
Q

At constant pressure volume of given mass of gas is directly proportional to

A

Absolute Temperature

96
Q

Absolute zero is unattainable temperature, current attempts have resulted in the lowest temperature of

A

10–⁵ K

97
Q

If temperature is increasing continuously then constant k in PV=k will

A

Increase

98
Q

What will happen to density of an ideal gas if both temperature and pressure are doubled

A

Remain same

99
Q

100m³ of a gas at 3atm and 27°C is transferred into a container having volume 300 m³ and temperature 327°C. Pressure in new container will be

A

2 atm

100
Q

Value of general gas constant R depends on

A

Units of P and V

101
Q

Which of the molecules have maximum root mean square velocity at 25°C

A

NH3

102
Q

Which of the following gas show maximum ideal behaviour

A

N2

103
Q

The density of Methane at 2atm pressure at 27°C is

A

1.3 gdm-3

104
Q

The correct mathematical form of Avogadro’s law is

A

V1\V2=n1\n2

105
Q

The deviation of gas from Ideal behaviour is maximum at

A

-10°C and 5atm

106
Q

If Absolute Temperature is doubled and the pressure is increased to four times, the volume of gas is

A

Half

107
Q

The average kinetic energy of gas molecules is

A

Directly proportional to its Absolute Temperature

108
Q

The compressibility factor Z for an ideal gas is

A

Equal to 1

109
Q

If we increase or decrease the amount of heat to a liquid, its boiling point will

A

Remain constant

110
Q

Which is the correct order of boiling points

A

H2O >HF >NH3 >CH4

111
Q

Evaporation of water depends upon

A

Surface area and intermolecular forces
speed of air above the liquid surface
humidity in air

112
Q

110°C boiling point of water corresponds to the external pressure

A

Between 760 to1200 torr

113
Q

Boiling point of compound is mostly raised by

A

Intermolecular hydrogen bonding

114
Q

Which has greater enthalpy of vaporization

A

I2 (iodine)

115
Q

Identify incorrect statement about evaporation

A

Exothermic

116
Q

Which mathematical relationship doesn’t correctly represent behaviour of an ideal gas

A

Pressure is inversely proportional to density

117
Q

Maximum vapour pressure is shown by

A

50 cm3 ethanol and 1dm3 ethanol

118
Q

Evaporation occurs at

A

All temperatures

119
Q

Which one is the most accurate method for the measurement of vapour pressure

A

Manometric method

120
Q

The vapour pressure of methanol at 40°C is less than

A

Ether

121
Q

The volume of a given mass of gas is _____ to the inverse of the pressure

A

Direclty Proprotional

122
Q

At constant temperature, by doubling the pressure volume of gas reduced to _____.

A

1/2 of original volume

123
Q

Gases aresoluble in water at:

A

➡Low Temperature
➡High Pressure

124
Q

The SI Unit of pressure is Nm-3. 10^03 atm is equal to:

A

0.101325 KPa

125
Q

Which one has more mass at STP

A

1 dm^3 of O2

126
Q

Two gases having same temperature and pressure will have:

A

➡Same volume
➡Same no. of molecules
➡Same moles

127
Q

For a given mass with initial volume “V”, if pressure is reduced t one half and absolute temperature is increasesd two times. The volume will become;

A

4V

128
Q

Which of the following expressions at constant pressure represents Charles’s law

A

V` ∝ T

129
Q

Which of the following relation is true for the density of an ideal gas

A

PM/RT

130
Q

If absolute temperature and pressure of gas is doubled then volume o gas will:

A

Remain unchanged

131
Q

The expression for root mean square velocity is:

A

c(r.m.s) = √3/2RT/M

132
Q

16g of each of CH4 and He are in a container at 50°C. The ratio of kinetic energy is:

A

1:4

133
Q

According to kinetic molceular theory the kinetic energy of gas molecules varies directly with:

A

Absolute Temperature

134
Q

Which of the following is NOT the basic assumption of the kinetic theory of gases:

A

➡The collisions among the molecule of the gas are perfectly elastic❌
➡The molecules of the gas are always in the state of ceaseless haphhazard motion❌
➡The pressure of a gas is due to collision of gas molecules with the walls of container❌
➡The molecules exert appreciable attraction on each other✅

135
Q

In gases, Temperature is the measure of;

A

Average translational Kinetic Energy

136
Q

Observed pressure of gas on the walls of container is less than actual pressure due to:

A

Inter molecular attractive forces

137
Q

A gas that has highest value for Van der Waals coefficient of attraction

A

NH3

138
Q

A gas under what conditions will behave non-ideally:

A

➡Temperature: Low
➡Pressure; High
(At low temperature and high pressure intermolecular forces develop significantly)

139
Q

Gases deviate from ideal behaviour at high pressure. Which of the following is correct for non-ideality?

A

At high pressure, the intermolecular attraction become significant

140
Q

Which of the following shows strange behaviour when subjected to gradual increase in pressure at 0°C

A

CO2

141
Q

In Boyles law, plot between pressure and constant ‘K’ obtained is::

A

Straight Line parallel to pressure axis

142
Q

If volume of O2 is 11.2dm3 at STP, then the number of moles would be:

A

0.5 moles

143
Q

Pressure remaining constant at which temperature the volume of gas will become twice of what it is at 0°C

A

546K

144
Q

If temperature of 1 mole of gas is raised by 1K, then it would absorb ____ amount of energy.

A

0.0821 dm3 atm

145
Q

When the value of general gas constant ‘R’ us given as 8.314. The relevant units will be;

A

J. mol-1. K-1

146
Q

In the ideal gas equation PV = nRT, the value of R depends upon:

A

Units of measurement

147
Q

The gas having highest density is:

A

Cl2

148
Q

According to Kinetic theory of gases which relation is correct:

A

PV = 2/3 kT

149
Q

The molecular velocity of a gas is:

A

Proportional to root mean square velocity of a gas

150
Q

The root mean square velocity is equivalent to:

A

➡C (r.m.s) = √3RT/M
➡C (r.m.s) = √3PV/M
➡C (r.m.s) = √3P/d

151
Q

If the temperature of a gas is increased four times then its average K.E.

A

Increases 4 times

152
Q

All of the following equations are expression for the ideal gas law:

A

➡PV = nRT
➡PV/T = constant
➡P1V1/T1 = P2V2/T2

153
Q

Real gases show more deviation from ideal behaviour under which of the following conditions:

A

➡at low temperature
➡high pressure

154
Q

In Van der Waal’s equation, if the value of ‘a’ and ‘b’ are zero for a certain gas, then the gas is:

A

Ideal

155
Q

Real gases deviate at low temperature from ideal behaviour due to;

A

Significant increase in the intermolecular attractive forces

156
Q

Effective volume of molecules per mole of a gas is ____ times greater than actual volume of 1 mole of gas molecules

A

4

157
Q

The compressibility factor, (Z=PV/nRT) has value at which a gas show maximum non-ideality in behaviour:

A

1.5
(Greater the value of ‘Z’, greater the real behaviour)

158
Q

Gases exert pressure on the walls of the container because the gas molecules:

A

Collide with the walls of the container

159
Q

Which one of the following is absolute zero

A

0 K

160
Q

Crystalline solids are classified on the basis of bonding into ___ types.

A

Four

161
Q

The number of molecules in 0.0112 m^3 of methane at 0°C and pressure of 760 mm Hg is:

A

3.01 x 10^23

162
Q

Which of the following will gave the same number of molecules at STP

A

280 cm^3 of CO2 and 280 cm^3 of N2O

163
Q

The graph between pressure and inverse of volume at constant temperature and number of moles

A

A straight line passing through the origin

164
Q

In a closed vessel of 1000 cm^3, H2 gas is heated from 27°C to 127°C. Which statement is correct?

A

The number of moles of gas increases

165
Q

The molecules of gas show more deviation from ideal behaviour at low temperatures, because;

A

Attractive force dominates at low temperature

166
Q

The gas laws are best applicable under the conditions:

A

➡Low P
➡High T

167
Q

The root means square velocity is expressed as:

A

(3RT/M)^1/2

168
Q

At constant pressure, the volume of a given mass of a gas is directly proportional to;

A

Absolute temperature

169
Q

Absolute zero is an unattainable temperature, current attempts have resulted in the lowest of:

A

10^-5 K

170
Q

If the temperature is increasing continuously then constant ‘k’ in PV=k will;

A

Increase

171
Q

What will happen to the density of an ideal gas, if both temperature and pressure are doubled;

A

Remain same

172
Q

100 m^3 of gas at 3atm and 27°C is transferred into a container having a volume of 300 m^3 and a temperature of 327°C. Pressure in the new container will be;

A

2 atm

173
Q

The value of the general gas constant ‘R’ depends upon;

A

Units of P and V

174
Q

Which of the following molecules has a maximum root mean square velocity at 25°C?

A

NH3

175
Q

Which of the following gas show maximum ideal behaviour

A

N2

176
Q

Which mathematical relationship doesn’t correctly represent the behaviour of an ideal gas

A

P ∝ 1/d

177
Q

The density of methane at 2 atm pressure at 27°C is;

A

1.3 g/dm^3

178
Q

The correct mathematical form of Avogadro’s law is:

A

V1/V2 = n1/n2

179
Q

Which one is most real at STP:

A

NH3

180
Q

The deviation of gas from ideal behaviour is maximum at:

A

-10°C and 5.0 atm
(At low temperatures or high pressures, real gases deviate significantly from ideal gas behaviour)

181
Q

If the absolute temperature is doubled and the pressure is increased to 4 times, the volume of gas is;

A

Half

182
Q

The average K.E of the gas molecules is;

A

Directly proportional to its absolute temperature

183
Q

The compressibility factor (Z) for an ideal gas is;

A

Equal to one

184
Q

At constant pressure, the volume of a given mass of a gas is directly proportional to;

A

Temperature

185
Q

The volume of a gas at S.T.P is 10 dm^3 at which temperature its volume will become 30 dm^3, keeping the pressure constant

A

819 K

186
Q

Absolute zero is an unattainable temperature, current attempts have resulted in the lowest temperature of;

A

10^-5 K

187
Q

Which of the following pairs of gases possess equal volume at STP

A

➡0.5 moles of NO
➡16 g O2

188
Q

Which of the following pairs have the same rates of diffusion;

A

➡N2O
➡CO2

189
Q

Units of PV are the same as that of;

A

Energy

190
Q

If the temperature is increasing continuously then constant ‘K’ in PV=K will;

A

Increase

191
Q

What will happen to the density of an ideal gas, if both temperature and pressure are doubled;

A

Remain same

192
Q

Absolute zero is;

A

-459.4°F

193
Q

A gas initially at 27°C is heated up to 327°C, and its average K.E will be;

A

Doubled

194
Q

100m^3 of a gas at 3 atm and 27°C is transferred into a container having a volume of 300m^3 with a temperature of 327°C. Pressure in new container will ber:

A

2 atm

195
Q

Value of general gas constant ‘R” depends upon:

A

Units of P and V

196
Q

The correct value of general gas constant R is;

A

8.314 x 10^7 erg mol^-1 K-1

197
Q

The absolute temperature of a gas is directly proportional to the average;

A

Translational kinetic energy

198
Q

Which pair of gases do not obey Dalton’s law of partial pressure;

A

➡NH3
➡HCl

199
Q

The ratio of the rate of diffusion of equal volumes of He and SO2 is:

A

4:1

200
Q

NH3 gas diffuses twice faster than the gas;

A

C5H8

201
Q

At the same temperature and pressure, two balloons are separately filled with H2 and O2. If O2 escapes at the rate of 60 cm/hr, the rate of diffusion of hydrogen will be:

A

240 cm/hr

202
Q

Which of the following molecules has a maximum root mean square velocity at 25°C

A

NH3

203
Q

Two balloons are filled with equal moles of H2 and He at STP. Which balloon will contract first if the same size holes are made in both of them?

A

Ballon filled with H2

204
Q

An ideal gas can’t be liquified because;

A

Forces between its molecules are negligible

205
Q

Which of the following gas show maximum ideal behaviour

A

N2

206
Q

The SI unit of ‘a’ is:

A

Nm^4mol^-2

207
Q

The least values of Van der Waal’s constants ‘a’ and ‘b’ are for:

A

Hydrogen

208
Q

Which mathematical relationship doesn’t correctly represent the behaviour of an ideal gas?

A

➡P ∝ CT❌
➡P ∝ dT❌
➡P ∝ 1/d✅

209
Q

Which statement is correct regarding Van Der Waal’s equation:

A

a NH3 > a N2 > and b NH3 > b N2

210
Q

A fire extinguisher delivers 2.2 kg of CO2. The volume of CO2 at STP is;

A

1120 dm^3

211
Q

The ratio of partial pressure of helium to the hydrogen in a mixture of 4g o hydrogen and 4g of helium is:

A

1/2

212
Q

A mixture of 64g each of SO2, O3, O2 and CH4 is taken in a cylinder, the correct order of their partial pressure is:

A

CH4>O2>O3>SO2
(Partial Pressure ∝ No. of moles ∝ m/M)

213
Q

The number of molecules in 0.0112 m^3 of methane at 0°C and pressure 760mmHg is:

A

3.01 x 10^23

214
Q

Which of the following will have the same number of molecules at STP

A

➡280 cm^3 of CO2
➡280 cm^3 of N2O

215
Q

The partial pressure of oxygen in the lungs is;

A

116 torr

216
Q

Gases deviate from ideal behaviour at high pressure. Which of the following is correct for non-ideality:

A

At high pressure, the inter-molecular attractions become insignificant

217
Q

Evaporation is designated as a cooling process because of the reason:

A

High energy molecules leave behind the low energy molecules and cause cooling

218
Q

Evaporating water depends upon the following;

A

➡Surface area and intermolecular forces
➡Speed of the air above the liquid surface
➡Humidity of air

219
Q

The graph between and inverse of volume at constant temperature and number of moles;

A

A straight line passing through the origin

220
Q

If both the temperature and volume of a gas are doubled, the pressure

A

Remain unchanged

221
Q

In a closed vessel of 1000 cm^3, H2 gas is heated from 27°C to 127°C. Which statement is not correct?

A

➡The rate of collision increases❌
➡Pressure of gas increases❌
➡The energy of gas molecules increases❌
➡The number of moles of gas ✅

222
Q

Which one is the form of a general gas equation:

A

➡PV=nRT
➡PV=RT
➡P1V1/T1 = P2V2/T2

223
Q

The sudden expansion of the gas from high pressure towards the low-pressure causes:

A

Decrease in temperature

224
Q

The molecules of gas show more deviation from ideal behaviour at low temperatures, because

A

Attractive forces dominate at low temperature

225
Q

Which of the following temperature scale can not have a negative value:

A

Kelvin

226
Q

The gas laws are best applicable under the conditions;

A

➡Low P
➡High T

227
Q

Under high pressure which of the following gas show more ideality in character

A

N2

228
Q

Which is incorrect about ideal gas?

A

➡No force of attraction between molecules❌
➡No example in nature❌
➡Can be liquefied easily❌
➡Obey gas laws under all conditions of temperature and pressure✅

229
Q

Gases exert pressure on the walls of containers because the gas molecules:

A

Collide with the walls of the container

CHEMISTRY (19 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions