Chemical Process MCQs

Question 1

Prussian blue is chemically represented by

Accepted Answer

Fe4[Fe(CN6)3]

Answer

FeO.TiO2

Answer

CaSO4.2H2O

Answer

AlF3.3NaF

Question 2

Flash point of most vegetable oils is about __________ °C.

Accepted Answer

200

Answer

50

Answer

100

Answer

300

Question 3

In the Solvay process, the product from the calciner is

Accepted Answer

Light soda ash

Answer

Dense soda ash

Answer

Sodium bicarbonate

Answer

Dehydrated soda ash

Question 4

Magnesium and calcium __________ cause temporary hardness of water.

Accepted Answer

Bicarbonates

Answer

Carbonates

Answer

Phosphates

Answer

Sulphates

Question 5

Styrene (a monomer for the production of polystyrene) is commercially produced by

Accepted Answer

Catalytic dehydrogenation of ethyl benzene

Answer

Dehydration of ethyl alcohol followed by hydrogenation

Answer

Reacting ethylene oxide with acetal-dehyde

Answer

Fermentation of starch

Question 6

Mercury cells for caustic soda manufacture, compared to diaphragm cells

Accepted Answer

None of these

Answer

Require lower initial investment

Answer

Require more power

Answer

Produce lower concentration NaOH

Question 7

Trinitrotoluene (TNT), an explosive, is made by the nitration of

Accepted Answer

Toluene

Answer

Nitrobenzene

Answer

Nitrotoluene

Answer

Benzene

Question 8

__________ of rubber decreases after its vulcanisation.

Accepted Answer

Tackiness

Answer

Resistance to the action of organic solvent

Answer

Maximum service temperature

Answer

Tensile strength

Question 9

The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to

Accepted Answer

Avoid mechanical weakening of fibre

Answer

Remove lignin by way of crystallisation

Answer

Increase the cellulose content

Answer

None of these