The molality of a solution containing 1.8g of glucose dissolved in 250 g of water is _____________

(a)

0.2 M

(b)

0.01 M

(c)

0.02 M

(d)

0.04 M

Which one of the following is incorrect for ideal solution ?

(a)

\(\Delta H_{mix}=0\)

(b)

\(\Delta U_{mix}=0\)

(c)

\(\Delta P=P_{observed}-P_{calculated\ by\ raoults\ law}=0\)

(d)

\(\Delta G_{mix}=0\)

Osometic pressure (p) of a solution is given by the relation ____________

(a)

 = nRT

(b)

V = nRT

(c)

\(\pi\)RT = n

(d)

none of these

Normality of 1.25M sulphuric acid is ___________

(a)

1.25 N

(b)

3.75 N

(c)

2.5 N

(d)

2.25 N

Phenol dimerises in benzene having van't Hoff factor 0.54. What is the degree of association ?

(a)

0.46

(b)

92

(c)

46

(d)

0.92

Which of the following gas should have maximum value for k_H?

(a)

He

(b)

H₂

(c)

N₂

(d)

CO₂

Vapour pressure is the pressure exerted by vapours ____________

(a)

in equilibrium with liquid

(b)

in any condition

(c)

in an open system

(d)

in atmospheric conditions

The antiseptic solution of iodopovidone for the use of external application contains 10 % w/v of iodopovidone. Calculate the amount of iodopovidone present in a typical dose of 1.5 mL.

Define molality

State and explain Henry’s law.

What is osmosis ?

Explain the effect of pressure on the solubility.

Which solution has the lower freening point ? 10 g of methanol (CH₃OH) in 100 g of water (or) 20 g of ethanol (C₂H₅OH) in 200 g of water.

Define PPM.

Define evaporation.

Define solution

What volume of 4M HCl and 2M HCl should be mixed to get 500 mL of 2.5 M HCl ?

0.75 g of an unknown substance is dissolved in 200 g water. If the elevation of boiling point is 0.15 K and molal elevation constant is 7.5 K Kg mol^-1 then, calculate the molar mass of unknown substance

0.2 m aqueous solution of KCl freezes at -0.68ºC calculate van’t Hoff factor. k_f for water is 1.86 K kg mol^-1.

Define solution. Explain with an example.

Distinguish between ideal and non-ideal solution

Calculate the mole fractions of benzene and naphthalene in the vapour phase when an ideal liquid solution is formed by mixing 128 g of naphthalene with 39 g of benzene. It is given that the vapour pressure of pure benzene is 50.71 mm Hg and the vapour pressure of pure naphthalene is 32.06 mmHg at 300 K.

Henry’s law constant for solubility of methane in benzene is 4.2 x 10^-5 mm Hg at a particular constant temperature At this temperature.
Calculate the solubility of methane at
i) 750 mm Hg
ii) 840 mm Hg