Chemical Engineering Mcqs Practice Test

Question 1

80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is_________________?

Accepted Answer

B. 0.18

Question 2

The viscosity of water at room temperature may be around one ___________________?

Accepted Answer

A. Centipoise

Question 3

_________________ chart is a graph related to Antoine equation ?

Accepted Answer

B. Cox

Question 4

The molar composition of a gas is 10% H2, 10% O2, 30% CO2 and balance H2O. If 50% H2O condenses, the final mole percent of H2 in the gas on a dry basis will be_______________?

Accepted Answer

D. 20%

Question 5

The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be _____________ times?

Accepted Answer

C. √2

Question 6

If a solution of eutectic composition is cooled, _______________ reaching the eutectic temperature ?

Accepted Answer

B. It will undergo no change until

Question 7

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___________________?

Accepted Answer

B. Nature of the gas

Question 8

Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of________________?

Accepted Answer

D. Complete wetting

Question 9

The heat of solution depends upon the____________________?

Accepted Answer

D. All A., B. & C.

Question 10

pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be_________________?

Accepted Answer

C. 7

Question 11

In a chemical process, the recycle stream is purged for______________________?

Accepted Answer

C. Limiting the inerts

Question 12

Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ?

Accepted Answer

D. All the gases will have the same KE

Question 13

If 1 Nm3 of O2 contains ‘N’ number of molecules, then number of molecules in 2Nm3 of SO2 will be_________________?

Accepted Answer

C. 2N

Question 14

The heat capacity of a substance is ____________________?

Accepted Answer

A. Greater for liquid state than for solid state

Question 15

The total number of atoms in 8.5 gm of NH3 is _______________ × 1023?

Accepted Answer

A. 9.03

Question 16

As per Kirchhoff s equation, the heat of reaction is affected by the__________________?

Accepted Answer

C. Temperature

Question 17

A perfectly insulated container of volume V is divided into two equal halves by a partition. One side is under vacuum, while the other side has one mole of an ideal gas (with constant heat capacity) at 298 K. If the partition is broken, the final temperature of the gas in the container___________________?

Accepted Answer

C. Will be less than 298 K

Question 18

“The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the ______________ law?

Accepted Answer

B. Henry’s

Question 19

______________ equation gives the effect of temperature on heat of reaction ?

Accepted Answer

A. Kirchoff’s

Question 20

Addition of a non-volatile solute to a pure solvent ____________________?

Accepted Answer

D. Both B. and C.