STOICHIOMETRY QUIZ

The heat of vaporisation __________ with increase in pressure.

Becomes zero at critical pressure

Both B and C

Increases

Decreases

TRUE ANSWER : ?
YOUR ANSWER : ?

Pick out the wrong unit conversion of heat transfer co-efficient.

1 W/m² . °C = 0.1761 BTU/ft².hr.°F

1 BTU/ft².hr.°F = 4.88 kcal/m².hr.°C = 20.44 kJ/m².hr°C = 5.678 W/m².°C

1 kcal/m².hr.°K = 1.163 W/m².°C

1 kcal/m².hr.°C = 0.2048 BTU/ft².hr. °F. = 1.163 W/m².°K

TRUE ANSWER : ?
YOUR ANSWER : ?

Raoult's law is not applicable to the

Solutions containing non-volatile solute

Concentrated solutions

Both B & C

Solutes which dissociate or associate in the particular solution

TRUE ANSWER : ?
YOUR ANSWER : ?

Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the

Temperature of the liquid

Total pressure

Nature of the liquid

Nature of the gas

TRUE ANSWER : ?
YOUR ANSWER : ?

A gaseous mixture contains 14 kg of N₂, 16 kg of O₂ and 17 kg of NH₃. The mole fraction of oxygen is

0.66

0.16

0.33

0.47

TRUE ANSWER : ?
YOUR ANSWER : ?

No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules

Are above the inversion temperature

Do work equal to loss in kinetic energy

Exert no attractive force on each other

Collide without loss of energy

TRUE ANSWER : ?
YOUR ANSWER : ?

If a solution of eutectic composition is cooled, __________ reaching the eutectic temperature.

None of these

The solvent begins to freeze out even before

It will not solidify even on

It will undergo no change until

TRUE ANSWER : ?
YOUR ANSWER : ?

Cp - Cv, for an ideal gas is equal to

R/2

2R

R

3R

TRUE ANSWER : ?
YOUR ANSWER : ?

An azeotropic solution of two liquids has boiling point lower than either of them, when it

Shows negative deviation from Raoult's law

Is saturated

Shows positive deviation from Raoult's law

Is unsaturated

TRUE ANSWER : ?
YOUR ANSWER : ?

The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg.?

0.4

0.6

0.2

0.1

TRUE ANSWER : ?
YOUR ANSWER : ?

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