Stoichiometry MCQs

Question 1

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

Accepted Answer

1

Answer

2.42

Answer

1.987

Answer

4.97

Question 2

In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is

Accepted Answer

60.3

Answer

180

Answer

720

Answer

200

Question 3

Viscosity of 1 centipoise is equal to 1 centis-toke in case of

Accepted Answer

Water

Answer

Mercury

Answer

Carbon tetrachloride

Answer

None of these

Question 4

The heat capacity of a substance is

Accepted Answer

Greater for liquid state than for solid state

Answer

Lower for liquid state than for gaseous state

Answer

Higher for solid state than for liquid state

Answer

Equal for solid and liquid states below melting point

Question 5

The unit of specific heat at constant pressure, C p , in SI unit is

Accepted Answer

J/kg°K

Answer

W/m 2 °C

Answer

W/m°K

Answer

J/m 3 °K

Question 6

A sugar solution containing __________ percent sugar is equivalent to 1 Brix.

Accepted Answer

1

Answer

0.01

Answer

0.1

Answer

10

Question 7

If 1.5 moles of oxygen combines with aluminium to form Al 2 O 3 , then the weight of aluminium (atomic weight = 27) used in this reaction is __________ gm.

Accepted Answer

54

Answer

27

Answer

5.4

Answer

2.7

Question 8

The atomic heat capacities of all solid elements __________ with decrease in temperature.

Accepted Answer

Decreases

Answer

Increases

Answer

Remains unchanged

Answer

Approach zero at 0°C

Question 9

Pick out the correct statement.

Accepted Answer

The end points of a vapor-pressure vs. temperature curve are critical and triple points

Answer

A substance existing above its critical temperature is called a saturated vapor

Answer

A mixture of vapor gas is called saturated, if the equilibrium vapor pressure of the liquid is more than the partial pressure of the vapor at the same temperature

Answer

Heat added to or given up by a substance at constant temperature is called the sensible heat