Solutions

Question 1

Brass is made up of

Answer 1

Copper(Cu) and Zinc(Zn)

Question 2

German silver is made up of

Answer 2

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

Question 3

Bronze is made up of

Answer 3

Copper(Cu) and Tin(Sn)

Question 4

What prevents tooth decay?

Answer 4

1ppm of fluoride ions in water

Question 5

What causes tooth to be mottled?

Answer 5

1.5ppm of fluoride ions in water

Question 6

High concentration of fluoride ions is..

Answer 6

Poisonous

Question 7

Gas in gas solution given in NCERT text is

Answer 7

Mixture of oxygen and nitrogen gases

Question 8

Liquid in gas solution given in NCERT textbook is

Answer 8

Chloroform mixed with nitrogen gas

Question 9

Solid in gas solution given in NCERT is

Answer 9

Camphor in nitrogen gas

Question 10

Gas in liquid solution given in NCERT is

Answer 10

oxygen dissolved in water

Question 11

Liquid in liquid soltuion given in NCERT is

Answer 11

Ethanol dissolved in water

Question 12

Solid in liquid solution given in NCERT is

Answer 12

Glucose dissolved in water

Question 13

Gas in solid solution given in NCERT is

Answer 13

Solution of hydrogen in palladium

Question 14

Liquid in solid solution given in NCERT is

Answer 14

Amalgam of mercury with sodium

Question 15

Solid in Solid solution given in NCERT is

Answer 15

copper dissolved in gold(alloys)

Question 16

Commercial bleaching solution is made up of

Answer 16

3.62 mass percentage of sodium hypochlorite(NaClO)

Question 17

Composition of Antifreeze used in cars to cool the engine is

Answer 17

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

Question 18

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

Answer 18

255.4K or -17.6C

Question 19

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

Answer 19

its solubility increases with increase in temperature

Question 20

If dissolution of a solid in liquid is exothermic then

Answer 20

its solubility decreases with increase in temperature.

Question 21

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

Answer 21

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

Question 22

does pressure affect the solubility of a solid in liquid?

Answer 22

no, solids are highly incompressible

Question 23

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

Answer 23

solubility of gas in liquid increases with increase in pressure

Question 24

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

Answer 24

directly proportional

Question 25

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

Answer 25

solubility of gas in liquid decreases with increase in temperature

Question 26

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

Answer 26

lower is its solubility

Question 27

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

Answer 27

Inversely proportional

Question 28

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

Answer 28

helium

Question 29

the air tank of scuba divers contains

Answer 29

11.7% helium,56.2% nitrogen and 32.1% oxygen

Question 30

Examples for nearly ideal solutions are

Answer 30

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

Question 31

Solutions that show positive deviations are

Answer 31

acetone+ethanol carbon disulphide+acetone

Question 32

Solutions that show negative deviation are

Answer 32

phenol + aniline chloroform + acetone

Question 33

Example for minimum boiling azeotrope is

Answer 33

mixture of Ethanol and water

Question 34

Example for maximum boiling azeotrope is

Answer 34

mixture of Nitric acid and water

Question 35

Boiling point of Nitric acid and water azeotrope is

Answer 35

393.5K

Question 35

Composition of nitric acid and water azeotrope is

Answer 35

68% nitric acid and 32% water by mass

Question 36

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

Answer 36

decreases

Question 37

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

Answer 37

increases

Question 37

when does a liquid boil?

Answer 37

when its vapour pressure is equal to the atmospheric pressure

Question 38

When does a solution freeze?

Answer 38

when its vapour pressure equals the vapour pressure of solid solvent

Question 38

Elevation of boiling point of dilute solution is directly proportional to

Answer 38

molal concentration of solute

Question 38

The boiling point elevation constant Kb is also called

Answer 38

molal elevation constant (ebullioscopic constant)

Question 39

name the synthetic semipermeable membrane

Answer 39

cellophane

Question 39

The FPD constant Kf and BPE constant Kb depends on

Answer 39

nature of solvents

Question 40

Freezing point depression constant is also called

Answer 40

molal depression constant(Cryoscopic constant)

Question 41

Examples for semipermeable membranes are

Answer 41

pig's bladder,parchment, cellophane

Question 42

Freezing point depression constant for dilute solutions is directly proportional to

Answer 42

molality of solution(m)

Question 43

Osmotic pressure of dilute solutions is directly proportional to

Answer 43

Molarity(M)

Question 43

Osmotic pressure is useful because

Answer 43

*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

Question 44

Osmotic pressure is useful for

Answer 44

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

Question 45

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

Answer 45

0.9% (m/v) sodium chloride solution

Question 46

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

Answer 46

normal saline solution

Question 47

the semipermeable membrane used in desalination of sea water is

Answer 47

Cellulose acetate