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WAZZAP > Quiz 7 > Flashcards

Quiz 7 Flashcards

1
Q
  1. Of the following elements the one that always has the oxidation number –1 in its compound is

hydrogen

sodium

fluorine

oxygen

A

fluorine

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2
Q
  1. If an element is in its lowest oxidation state, under appropriate circumstances, it can act as

a reducing agent

an oxidizing agent

either an oxidizing agent or a reducing agent depending upon whether its oxidizing number is negative or positive

neither an oxidizing agent nor a reducing agent

A

an oxidizing agent

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3
Q
  1. The atom with high electronegativity value

a small tendency to attract electrons

no tendency to attract electrons

a large tendency to attract electrons

the attraction for electrons does not depend upon electronegativity but upon electron affinity

A

a large tendency to attract electrons

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4
Q
  1. Which pair of elements is most likely to combine to form compounds by sharing electrons?

Li and F

B and C

Cs and I

Mg and O

A

B and C

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5
Q
  1. An isotope of hydrogen is

neptunium

plutonium

thorium

tritium

A

tritium

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6
Q
  1. Which element has the greatest tendency to lose electrons?

F

S

Fr

Be

A

Fr

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7
Q
  1. An electron emitted from the nucleus of a radioactive element is called

positron

antiproton

β-particle

alpha particle

A

β-particle

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8
Q
  1. Transmutation of element was first of all achieved in the laboratory by

Rutherford

Hertz

Fermi

Strassman and Hahn

A

Strassman and Hahn

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9
Q
  1. In a chemical reaction equilibrium is said to have been established when the

Concentrations of reactants and products are equal

Opposing reaction cease

Velocities of opposing reactions become equal

Temperatures of opposing reactions are equal

A

Velocities of opposing reactions become equal

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10
Q
  1. A pressure cooker reduces cooking time because _______.

The heat is more evenly distributed

The higher pressure tenderizes the food

The boiling point is elevated

A large flame must be used

A

The boiling point is elevated

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11
Q
  1. The movement of gas molecules through a pinhole.

diffusion

effusion

transmission

desorption

A

effusion

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12
Q
  1. It is the point in a phase diagram at which the last drop of liquid disappears.

dew point

bubble point

saturation point

tie line

A

dew point

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13
Q
  1. Crystallization occurs in a solution that is

concentrated

unsaturated

supersaturated

saturated

A

supersaturated

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14
Q
  1. Milk is a example of

Gel

Sol

Foam

Emulsion

A

Emulsion

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15
Q
  1. An aerosol is a colloidal system consisting of

A gas dispersed in solid

A liquid dispersed in solid

A liquid dispersed in a gas

A solid dispersed in a gas

A

A solid dispersed in a gas

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16
Q
  1. Which one of the following is a colloid?

Blood

Cane sugar

Urea

NaCl

A

Blood

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17
Q
  1. Colloids and crystalloids differs in

Solubility

Particle size

Radius

Diameter

A

Particle size

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18
Q
  1. Buffer solutions have

Reserve acidity only

Reserve alkalinity

pH equal to 7

Reserve acidity as well as reserve alkalinity

A

Reserve acidity as well as reserve alkalinity

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19
Q
  1. The bond formed between hydrogen and halogen is of

covalent nature

electrovalent nature

polar nature

Co – ordinate nature

A

Covalent nature

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20
Q
  1. Aqua regia is prepared by adding conc. HNO3 to

conc. H2SO4

conc. H3PO4

conc. HCl

conc. HBr

A

conc. HCl

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21
Q
  1. Which is the strongest acid amongst the following?

HClO

HClO2

HClO3

HClO4

A

HClO4

22
Q
  1. What do you call the volume occupied by a unit mass of fluid?

specific volume

density

specific gravity

specific weight

A

specific volume

23
Q
  1. A leak from a faucet comes out in separate drops. Which of the following is the main cause of this phenomenon?

gravity

air resistance

viscosity of the fluid

surface tension

A

surface tension

24
Q
  1. Hydrometer is used to find out

specific gravity of liquids

specific gravity of solids

specific gravity of gases

relative humidity

A

specific gravity of liquids

25
Q
  1. Who determined that energy is radiated only when an electron falls from a higher energy level to a lower energy level?

Einstein

Rutherford

Heisenberg

Bohr

A

Bohr

26
Q
  1. Who determined the charge of an electron by means of the oil droplet experiment?

Rutherford

Heisenberg

Millikan

de Broglie

A

Millikan

27
Q
  1. Who showed that electrons can be considered to have both particle character and wave character?

Thompson

Moseley

Heisenberg

de Broglie

A

de Broglie

28
Q
  1. Who determined that no two electrons may have the same set of four quantum numbers?

Planck

Pauli

Hund

Rutherford

A

Pauli

29
Q
  1. The quantity of heat needed to raise the temperature of a substance 1°C is its

heat capacity

specific heat

enthalpy

calorimetry

A

heat capacity

30
Q
  1. The properties of a real gas are most likely to deviate from those properties predicted for an ideal gas when

the pressure is low

the temperature is high

the pressure is high and the temperature is low

the pressure is low and the temperature is high

A

the pressure is high and the temperature is low

31
Q
  1. From the thermal decomposition of a pure solid, we obtained a solid and a gas, each of which is a pure substance. From this information, we can conclude with certainty that

the original solid is not an element

at least one of the products is an element

both products are elements

the solid is a compound and the gas is an element

A

the original solid is not an element

32
Q
  1. The critical point for a mixture occurs for which of the following cases?

the vapor and liquid have a single form

the liquid has no absorbed gas

the vapor phase is stable

the liquid is completely vaporized

A

the vapor and liquid have a single form

33
Q
  1. Which of the following elements and compounds is unstable in its pure form?

sodium

helium

carbon dioxide

neon

A

sodium

34
Q
  1. A substance is oxidized when which of the following occurs?

it turns red

it becomes more negative

it loses electrons

it gives off heat

A

it loses electrons

35
Q
  1. Which of the following affects most of the electrical and thermal properties of materials?

the atomic weight expressed in grams per gram-atom

the electrons, particularly the outermost ones

the magnitude of the electrical charge of the protons

the weight of the atoms

A

the electrons, particularly the outermost ones

36
Q
  1. In molecules of the same composition, what are variations of atomic arrangements known as?

polymers

monomers

crystal systems

isomers

A

isomers

37
Q
  1. What device is used to measure the amount of infrared radiation in each portion of a persons skin that is emitted?

thermograph

thermometer

pyrometer

potentiometer

A

thermograph

38
Q
  1. If the freezing point of water is 0°C, which of the following is its melting point?

slightly less than 0°C

slightly more than 0°C

0°C

32°C

A

0°C

39
Q
  1. The amount of heat required to change the substance from solid to liquid state without change in temperature is known as the latent heat of _____.

evaporation

vaporization

condensation

fusion

A

fusion

40
Q
  1. Why are metals good conductors of heat?

because they contain free electrons

because their atoms are relatively far apart

because their atoms collide frequently

because they have reflecting surfaces

A

because they contain free electrons

41
Q
  1. What usually happen when a vapor condenses into a liquid?

it evolves heat

it generates heat

its temperature increases

it boils with temperature less than 100°C

A

it evolves heat

42
Q
  1. Which of the following is the science of low temperatures?

thermokinetics

thermodynamics

ergonomics

cryogenics

A

cryogenics

43
Q
  1. Calcite is

potassium carbonate

calcium carbonate

sodium hydroxide

calcium hydroxide

A

calcium carbonate

44
Q
  1. The number of molecules in 22.4 liters (under standard conditions) of a substance in its gaseous state, is called

Dulong’s number

Petit’s number

Avogadro’s number

Gay-Lussac’s number

A

Avogadro’s number

45
Q
  1. Ozone, O3, filters out a large amount of the ultraviolet and other dangerous radiations from the sun. It is found in the:

troposphere

thermosphere

stratosphere

lithosphere

A

stratosphere

46
Q
  1. One ingredient present in all baking powder is

sodium citrate

sodium betabisulfate

sodium bicarbonate

potassium tartrate

A

sodium bicarbonate

47
Q
  1. What is defined as the quantity of heat needed to raise the temperature of one kilogram of water by one degree Celsius?

kilojoule

BTU

kilocalorie

latent heat

A

kilocalorie

48
Q
  1. Who coined the word energy?

James Joule

Tomas Young

Rodulf Diesel

Lord Kelvin

A

Tomas Young

49
Q
  1. Isotopes have different

period number

group number

number of nucleons

atomic number

A

number of nucleons

50
Q
A

WAZZAP (31 decks)

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