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Solutions Flashcards

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1
Q

Brass is made up of

A

Copper(Cu) and Zinc(Zn)

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2
Q

German silver is made up of

A

Copper(Cu) , Zinc(Zn) and Nickel(Ni)

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3
Q

Bronze is made up of

A

Copper(Cu) and Tin(Sn)

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4
Q

What prevents tooth decay?

A

1ppm of fluoride ions in water

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5
Q

What causes tooth to be mottled?

A

1.5ppm of fluoride ions in water

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6
Q

High concentration of fluoride ions is..

A

Poisonous

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7
Q

Gas in gas solution given in NCERT text is

A

Mixture of oxygen and nitrogen gases

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8
Q

Liquid in gas solution given in NCERT textbook is

A

Chloroform mixed with nitrogen gas

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9
Q

Solid in gas solution given in NCERT is

A

Camphor in nitrogen gas

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10
Q

Gas in liquid solution given in NCERT is

A

oxygen dissolved in water

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11
Q

Liquid in liquid soltuion given in NCERT is

A

Ethanol dissolved in water

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12
Q

Solid in liquid solution given in NCERT is

A

Glucose dissolved in water

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13
Q

Gas in solid solution given in NCERT is

A

Solution of hydrogen in palladium

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14
Q

Liquid in solid solution given in NCERT is

A

Amalgam of mercury with sodium

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15
Q

Solid in Solid solution given in NCERT is

A

copper dissolved in gold(alloys)

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16
Q

Commercial bleaching solution is made up of

A

3.62 mass percentage of sodium hypochlorite(NaClO)

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17
Q

Composition of Antifreeze used in cars to cool the engine is

A

35v/v% of Ethylene glycol (CH2OH)2

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18
Q

antifreeze used in car engines lowers the freezing point of water to

A

255.4K or -17.6C

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19
Q

If dissolution of a solid in liquid is endothermic then it’s solubility

A

its solubility increases with increase in temperature

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20
Q

If dissolution of a solid in liquid is exothermic then

A

its solubility decreases with increase in temperature.

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21
Q

does temperature has any effect on solubility of a solid in liquid?

A

yes, increases solubility if dissolution is endothermic.. decreases solubility if not

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22
Q

does pressure affect the solubility of a solid in liquid?

A

no, solids are highly incompressible

23
Q

what happens to the solubility of a gas in liquid if pressure is increased?

A

solubility of gas in liquid increases with increase in pressure

24
Q

how is Henry’s constant(Kh) related to temperature? [ATMS]

A

directly proportional

25
Q

what happens to the solubility of a gas in liquid if temperature is increased?

A

solubility of gas in liquid decreases with increase in temperature

26
Q

if at a given pressure, Henry’s constant(Kh) value of gas in liquid solution is higher,then it’s solubility is

A

lower is its solubility

27
Q

how is Henry’s constant(Kh) related to solubility? [ATMS]

A

Inversely proportional

28
Q

To avoid risk of bends, the air tanks of scuba divers is diluted with

A

helium

29
Q

the air tank of scuba divers contains

A

11.7% helium,56.2% nitrogen and 32.1% oxygen

30
Q

Examples for nearly ideal solutions are

A

n-hexane and n-heptane
bromoethane and chloroethane
benzene and toulene.

31
Q

Solutions that show positive deviations are

A

acetone+ethanol
carbon disulphide+acetone

32
Q

Solutions that show negative deviation are

A

phenol + aniline
chloroform + acetone

33
Q

Example for minimum boiling azeotrope is

A

mixture of Ethanol and water

34
Q

Example for maximum boiling azeotrope is

A

mixture of Nitric acid and water

35
Q

Boiling point of Nitric acid and water azeotrope is

A

393.5K

35
Q

Composition of nitric acid and water azeotrope is

A

68% nitric acid and 32% water by mass

36
Q

What happens to the vapour pressure of solvent when non volatile solute is added?

A

decreases

37
Q

What happens to the vapour pressure of solvent if temprature is raised?

A

increases

37
Q

when does a liquid boil?

A

when its vapour pressure is equal to the atmospheric pressure

38
Q

When does a solution freeze?

A

when its vapour pressure equals the vapour pressure of solid solvent

38
Q

Elevation of boiling point of dilute solution is directly proportional to

A

molal concentration of solute

38
Q

The boiling point elevation constant Kb is also called

A

molal elevation constant (ebullioscopic constant)

39
Q

name the synthetic semipermeable membrane

A

cellophane

39
Q

The FPD constant Kf and BPE constant Kb depends on

A

nature of solvents

40
Q

Freezing point depression constant is also called

A

molal depression constant(Cryoscopic constant)

41
Q

Examples for semipermeable membranes are

A

pig’s bladder,parchment, cellophane

42
Q

Freezing point depression constant for dilute solutions is directly proportional to

A

molality of solution(m)

43
Q

Osmotic pressure of dilute solutions is directly proportional to

A

Molarity(M)

43
Q

Osmotic pressure is useful because

A

*measurement is around room temperature(biomolecules are not stable at high temps)
*molarity is used instead of molarity
*magnitude is large for even very diluted solutions

44
Q

Osmotic pressure is useful for

A

*calculating molar masses of proteins ,polymers,biomolecules and other macromolecules

45
Q

Osmotic pressure associated with the fluid inside the blood is equivalent to that of

A

0.9% (m/v) sodium chloride solution

46
Q

0.9% (m/v) sodium chloride solution is called

A

normal saline solution

47
Q

the semipermeable membrane used in desalination of sea water is

A

Cellulose acetate

Chemistry (7 decks)

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