Molarity of the liquid HCL if density of the solution is 1.17 g/cc is 

1

(a)

36.5

(b)

18.25

(c)

32.05

(d)

42.10

5ml of 1 N HCI, 20ml of N/2 H₂SO₄ and 30ml of N/3 HNO₃ are mixed together and the volume made to one litre. The normality of the resulting solution is

1

(a)

N/5

(b)

N/10

(c)

N/20

(d)

N/40

Which one of the following gases has the lowest value of the Henry's law constant ?

1

(a)

N₂

(b)

He

(c)

H₂

(d)

CO₂

The system that forms maximum boiling azeotrope is

1

(a)

carbon disulphide-acetone

(b)

benzene-tolune

(c)

acetone-chloroform

(d)

n-hexane-n-heptane

The molal freezing point constant of water is 1.86^o C/M. Therefore the freezing point of 0.1 M NaCl solution in water is expected to be

1

(a)

- 1.86^oC

(b)

- 0.186^oC

(c)

- 0.372^oC

(d)

+ 0.372^oC

Camphor is often used in molecular mass determination because

1

(a)

it is readily available

(b)

it has a very high cryoscopic constant

(c)

it is volatile

(d)

it is solvent for organic substances

A 5% solution of cane sugar (molar mass 342) is Isotonic with 1% of a solution of an unknown solute. The molar mass of unknown solute in g/mol is

1

(a)

136.2

(b)

171.2

(c)

68.4

(d)

34.2

The osmotic pressure of 0.1 M aqueous solution of NaCl is ................ Osmotic pressure of 0.1 M aqueous solution of glucose

1

(a)

equal to

(b)

less than

(c)

half of

(d)

nearly double

Which of the following units is useful in relating concentration of solution with its vapour pressure ?

1

(a)

mole fraction

(b)

parts per million

(c)

mass percentage

(d)

molality

On dissolving sugar in water at room temperature, solution feels cool to touch. Under which of the following cases dissolution of sugar will be most rapid ?

1

(a)

 Sugar crystals in cold water

(b)

 Sugar crystals in hot water

(c)

Powdered sugar in cold water

(d)

Powdered sugar in hot water

Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult's law?

1

(a)

Methanol and acetone

(b)

Chloroform and acetone

(c)

Nitric acid and water

(d)

Phenol and aniline

The unit of ebullioscopic constant is __________________.

1

(a)

K kg mol^-1 or K (molality)^-1

(b)

mol kg K^-1 or K^-1 (molality)

(c)

kg mol^-1 K^-1 or K^-1 (molality)^-1

(d)

K mol kg^-1 or K (molality)

At a given temperature, osmotic pressure of a concentrated solution of a substance .............. .

1

(a)

is higher than that at a dilute solution

(b)

is lower than that of a dilute solution

(c)

is same as that of a dilute solution

(d)

can not be compared with osmotic pressure of dilute solution.

Value of Henry's constant K_H ___________________.

1

(a)

increases with increase in temperature

(b)

decreases with increase in temperature

(c)

remains constant

(d)

first increases, then decreases

The value of Henry's constant K_H is ____________________.

1

(a)

greater for gases with higher solubility

(b)

greater for gases with lower solubility

(c)

constant for all gases

(d)

not related to the solubility of gases

If two liquids A and B form minimum boiling azeotrope at some specific composition, then .................... .

1

(a)

A - B interactions are stronger than those between A - A or B - B

(b)

vapour of solution increases because more number of molecules of liquids A and B can escape from the solution.

(c)

vapour pressure of solution decreases because less number of molecules of only one of the liquids escape from the solution.

(d)

A - B interactions are weaker than those between A - A or B - B.

On the basis of the information given below mark the correct option.
Information: On adding acetone to methanol some of the hydrogen bonds between methanol molecules break.

1

(a)

At specific composition, methanol - acetone mixture will form minimum boiling azeotrope and will show positive deviation from Raoult's law.

(b)

At specific composition, methanol - acetone mixture forms maximum boiling azeotrope and will show positive deviation from Raoult's law

(c)

At specific composition methanol - acetone mixture will form minimum boiling azeotrope and will show negative deviation from Raoult's law

(d)

At specific composition methanol - acetone mixture will form maximum boiling azeotrope and will show negative deviation from Raoult's law

K_H value for Ar(g), CO₂(g), HCHO (g) and CH₄ (g) are 4.39,1.67,1.83 x 10^-5 and 0.413 respectively. Arrange these gases in the order of their increasing solubility.

1

(a)

HCHO42

(b)

HCHO24

(c)

Ar24

(d)

Ar42

Which following factor (s) affect the solubility of a gaseous solute in the fixed volume of liquid solvent ?
(i) nature of solute
(ii) temperature
(iii) pressure

1

(a)

(i) and (iii) at constant T

(b)

(i) and (ii) at constant P

(c)

(ii) and (iii) only

(d)

(iii) only

The volumes of 4 N HCI and 10 N HCI required to make 1 litre of 6 N HCI are

1

(a)

0.75 litre of 4 N HCI and 0.25 litre of 10 N HCI

(b)

0.25 litre of 4 N HCI and 0.75 litre of 10 N HCI

(c)

0.67 litre of 4 N HCI and 0.33 litre of 10 N HCI

(d)

0.80 litre of a N HCI and 0.20 litre of 10 N HCI

(e)

0.50 litre of 4 N HCI and 0.50 litre of 10 N HCI

If P^o and P_s are the vapour pressures of the solvent and its solution respectively and N₁ and N₂ are the mole fractions of the solvent and solute respectively, then

1

(a)

P_S = P^oN₂

(b)

P^o - P_S = P^oN₂

(c)

P_S = P^oN₁

(d)

(P^o - P_S)/P_S = N₁/(N₁ + N₂).

The vapour pressure of a dilute solution of a solute is not influenced by

1

(a)

nature of the solute if it is non - electrolyte

(b)

mole fraction of the solute

(c)

melting point of the solute

(d)

degree of dissociation of the solute

Which statements are true about osmotic pressure (\(\pi \) )volume (V) and temperature (T) ?

1

(a)

\(\pi \alpha \frac { 1 }{ V } if \ T \ is \ constant\)

(b)

\(\pi \alpha T\quad if \ V \ is \ constant\)

(c)

\(\pi \alpha V \ if \ T \ is \ costant\)

(d)

\(\pi V \ is \ constant \ if \ T \ is \ constant\)

The colligative properties of a solution are

1

(a)

\(\alpha \ molality\)

(b)

\(\alpha \ \frac { 1 }{ molecular \ mass \ of \ the \ solute } \)

(c)

proportional to each other 

(d)

independent of the nature of the solute, i.e., electrolyte or non - electrolyte

In the depression of freezing point experiment, it is found that

1

(a)

The vapour pressure of the solution is less than that of pure solvent

(b)

The vapour pressure of the solution is more than that of pure solvent

(c)

Only solute molecules solidity at the freezing point

(d)

Only solvent molecules solidity at the freezing point.

Measurement of which colligative property is preferred for determination of molar mass.

1

(a)

Osmotic pressure.

State Raoult's law for a solution containing volatile components.

1

(a)

The vapour pressure of each component is directly proportional to the mole fraction of each component.

Define 'mole fraction' of a substance in a solution.

1

(a)

Mole fraction of a substance is defined as the ratio of number of moles of substance to the total number of moles of solute and solvent.

Define Ebullioscopic constant or molal elevation constant.

1

(a)

Molal Elevation Constant (Ebullioscopic Constant:) It is equal to elevation in boiling point of 1 molal solution, i.e. 1 mole of solute is dissolved in 1 kg of solvent. It is also called ebullioscopic constant. The units of k_b is K/m or ^oC/m or K kg mol^-1, where 'm' is molality.

Molality of a solution is .............. of the solute in .............. of the .................. .

1

(a)

no.of moles, 1000g (1kg), solvent

An ionic compound dissolves in water if .............. energy is greater than ............ energy.

1

(a)

hydration, lattice

The solubility of a solute decreases with increase of temparature if dissolution is .............. .

1

(a)

exothermic

The variation of vapour pressure with temperature is quantitatively studied by ............... equation.

1

(a)

Clausius - Clapeyron

For a non-ideal solution showing positive deviations, \({ \Delta V }_{ mixing }\) is ....................... and \({ \Delta H }_{ mixing }\) is ............ .

1

(a)

positive, positive

The constant boiling mixture of two miscible liquids of a definite mole fraction is called .............. .

1

(a)

azeotrope

A non-ideal solution showing negative deviations forms an azeotrope with ................. boilind point (lowest or highest).

1

(a)

highest

The semipermeable membrane generally used in the reverse osmosis is made up of ............... .

1

(a)

cellulose acetate

Solutions having the same osmotic pressure are called ........... and they have same ............. .

1

(a)

isotonic, molar concentration

The rupturing of a plant or animal cell due to flow of water into it is called ............ .

1

(a)

hemolysis

The shrinking of a plant or animal cell due to outflow of water is called ............. .

1

(a)

plasmolysis or crenation

People taking a lot of salt develop swelling or puffiness of their tissues. This disease is called ............ .

1

(a)

edema

The best colligative property to determine the molecular masses of polymers is ........... .

1

(a)

osmotic pressure

The vapour pressure of water at 100^oC is ......... bar.

1

(a)

1.013

The molal depression constant of water is ............ while that of benzene is ................. .

1

(a)

1.86 K kg mol^-1, 5.12 K kg mol^-1

Rast method is based upon the use of ............ as solvent whose molal depression constant is ................ .

1

(a)

comphor, 39.7 K kg mol^-1

In terms of osmotic pressure (\(\pi \)) and volume of the solution (V) containing n moles of the solute, van't Hoff factor (i) at temperature T = _______

1

(a)

\(\pi =i\frac { n }{ V } RT \ or \ i=\frac { \pi V }{ nRT } \)

State Henry's law about partial pressure of a gas in a mixture.

1

(a)

Henry's law states that the mass of a gas dissolved in given volume of the liquid at constant temperature depends upon the pressure applied.

Define an ideal solution.

1

(a)

Soltions which obey Raoult's law over the entire range of concentration at specific temperature.

Some liquids on mixing form 'azeotropes'. What are 'azeotropes'?

1

(a)

Azeotropes: Binary mixtures having same composition in liquid and vapour phase and boil at a constant temperature.