Stoichiometry MCQs

Question 1

The reverse process of fractional crystallisation is called

Accepted Answer

Leaching

Answer

Stripping

Answer

Differential distillation

Answer

Absorption

Question 2

Dissolving a solute in a solvent does not change its

Accepted Answer

None of these

Answer

Specific heat

Answer

Vapour pressure

Answer

Viscosity

Question 3

What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C?

Accepted Answer

$$\frac{1}{3}$$

Answer

$$\frac{2}{3}$$

Answer

$$\frac{1}{2}$$

Answer

$$\frac{1}{3} 	imes \frac{{273}}{{298}}$$

Question 4

The viscosity of water at room temperature may be around one

Accepted Answer

Centipoise

Answer

Poise

Answer

Stoke

Answer

Both B & C

Question 5

Raoult's law is not applicable to the

Accepted Answer

Both B & C

Answer

Solutes which dissociate or associate in the particular solution

Answer

Concentrated solutions

Answer

Solutions containing non-volatile solute

Question 6

The elevation in boiling point of a solution is proportional to the __________ of the solution.

Accepted Answer

Molal concentration

Answer

Reciprocal of the molal concentration

Answer

Normality

Answer

Molarity

Question 7

For an ideal gas, the compressibility factor

Accepted Answer

Is unity at all temperature

Answer

Decreases with pressure rise

Answer

Is unity at Boyle's temperature

Answer

Zero

Question 8

S.T.P. corresponds to

Accepted Answer

1 atm. absolute pressure & 15.5°C

Answer

760 mm Hg gauge pressure & 15.5°C

Answer

760 torr & 0°C

Answer

101.325 kPa gauge pressure & 15.5°C

Question 9

Unit of power is

Accepted Answer

Both B & C

Answer

Joule

Answer

Watt

Answer

Joule/Second