STOICHIOMETRY QUIZ

Roult's law is obeyed by a __________ solution.

Normal

None of these

Saturated

Molar

TRUE ANSWER : ?
YOUR ANSWER : ?

Average molecular weight of air is about

23

21

79

29

TRUE ANSWER : ?
YOUR ANSWER : ?

The crystallisation of a solute from a solution may be done by

Changing the nature of the system by the addition of a more soluble material

All of these

Change of temperature thereby causing supersaturation

Removal of pure solvent by evaporation

TRUE ANSWER : ?
YOUR ANSWER : ?

The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour

Is a function of the liquid phase composition

Measures the depression in freezing point

Measures the elevation in boiling point

Is not dependent on the temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

For the gaseous phase reaction, N₂ + O₂ ⇋ 2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by

Decrease in pressure

Increase in pressure

Decrease in temperature

Increasing the concentration of N₂

TRUE ANSWER : ?
YOUR ANSWER : ?

The unit of dynamic viscosity is

Both B & C

Stoke

Gm/cm sec

Poise

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following ratios defines the recycle ratio in a chemical process?

Gross feed stream/recycle feed stream

None of these

Recycle stream/fresh feed stream

Recycle stream/gross feed stream

TRUE ANSWER : ?
YOUR ANSWER : ?

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.

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

No component is concentrated at the surface of the solution

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

The attractive forces between like and unlike molecules are almost equal

TRUE ANSWER : ?
YOUR ANSWER : ?

Viscosity of atmospheric air may be about __________ centipoise.

1.5

0.015

150

15

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?

Use of equation of state

None of these

Activity co-efficient

Fugacity co-efficient

TRUE ANSWER : ?
YOUR ANSWER : ?