Stoichiometry MCQs

Question 1

Vapor pressure of water at 100°C is about __________ bar.

Accepted Answer

1.013

Answer

0.1013

Answer

10.13

Answer

101.3

Question 2

Gases diffuse faster compared to liquids because of the reason that the liquid molecules

Accepted Answer

Are held together by stronger inter-molecular forces

Answer

Move faster

Answer

Have no definite shape

Answer

Are heavier

Question 3

1 kcal/kg.°C is equivalent to __________ BTU/lb.°F.

Accepted Answer

1

Answer

2.42

Answer

4.97

Answer

None of these

Question 4

According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.

Accepted Answer

In the formation of solution, chemical combination/molecular association between unlike molecules takes place

Answer

No component is concentrated at the surface of the solution

Answer

The component molecules are non polar and are of almost equal size

Answer

The attractive forces between like and unlike molecules are almost equal

Question 5

In physical adsorption, as compared to chemisorption, the

Accepted Answer

Quantity adsorbed per unit mass is higher

Answer

Rate of adsorption is controlled by the resistance to surface reaction

Answer

Activation energy is very high

Answer

Heat of adsorption is very large

Question 6

Which of the following is insensitive to changes in pressure?

Accepted Answer

Both B & C

Answer

Heat of vaporisation

Answer

Melting point

Answer

Heat of fusion

Question 7

Solutions which distil without change in composition are called

Accepted Answer

Azeotropic

Answer

Ideal

Answer

Saturated

Answer

Supersaturated

Question 8

C p is expressed in S.I. unit as

Accepted Answer

J/kg.°K

Answer

0°K

Answer

W/m 2 .°C

Answer

W/m.°K

Question 9

The most convenient way of expressing solution concentration is in terms of

Accepted Answer

Molarity

Answer

Mole fraction

Answer

Normality

Answer

Molality