Chemical Process

Question 1

Purest form of water

Answer 1

Rain water

Question 2

With increase in temperature, the equilibrium constant at constant pressure (Kp) for oxidation of sulphur dioxide

Answer 2

decreases

Question 3

Electrodeposition of metals i.e. electroplating is never done on

Answer 3

Refractories

Question 4

Hollander beater used during paper pulp manufacture does not facilitate the __________ of fibre.

Answer 4

strengthening

Question 5

The biochemical treatment applied to sewage effluents is a process of

Answer 5

oxidation

Question 6

Sucrose content in cane sugar may be around __________ percent.

Answer 6

95

Question 7

Sweetest sugar

Answer 7

Fructose

Question 8

Main use of HCl

Answer 8

drilling of petroleum and pickling of steel sheets

Question 9

Sucrose content in the raw juice extracted from sugar cane is about __________ percent.

Answer 9

15-20

Question 10

Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture.

Answer 10

ZnO

Question 11

Haemoglobin is a/an

Answer 11

protein

Question 12

Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent.

Answer 12

50

Question 13

Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?

Answer 13

Pollution of water stream by mercury.

Question 14

In sulphate pulp manufacture, the pressure and temperature in the digestor is

Answer 14

10 atm, 170-180 C

Question 15

Frasch process is for

Answer 15

mining sulfur

Question 16

Very fine suspended and colloidal impurities are removed from water by a process called

Answer 16

coagulation

Question 17

Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

Answer 17

it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop.

Question 18

Calgon used in water treatment is chemically

Answer 18

sodium hexametaphosphate

Question 19

Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at

Answer 19

5 atm & 275°C

Question 20

Cumene is the starting material for the production of

Answer 20

phenol and acetone

Question 21

Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.

Answer 21

vanadium

Question 22

Dehydrogenation of isopropanol produces

Answer 22

acetone

Question 23

Concentration of hydrogen peroxide is done by

Answer 23

vacuum crystallisation

Question 24

Fermentation of molasses to produce ethyl alcohol is done at __________ °C

Answer 24

20-30

Question 24

Coagulant for the removal of suspended impurities in water is

Answer 24

alum

Question 25

__________ is used as a catalyst in fat splitting.

Answer 25

ZnO

Question 25

Which of the following is not produced on commercial scale from sea water?

Answer 25

Sodium sulfate

Question 26

Ordinary glass is not a/an

Answer 26

material with sharp definite melting point.

Question 27

Leblanc Process.

Answer 27

soda ash

Question 28

Lurgi coal gasifier is a pressurised __________ bed reactor.

Answer 28

moving

Question 29

Carboxymethyl cellulose (CMC) is added in detergents to act as a/an

Answer 29

anti soil redeposition agent

Question 30

Raw materials for ‘Solvay Process’ for manufacture of the soda ash are

Answer 30

salt, limestone and coke or gas.

Question 31

__________ process is used for the commercial production of nitric acid by the catalytic oxidation of ammonia.

Answer 31

Ostwald’s

Question 32

Phenol formaldehyde resin is used as an adhesive in making

Answer 32

laminates

Question 33

DDT

Answer 33

dichloro-diphenyl-trichloroethane

Question 34

DDT should not be allowed to come in contact with iron (during its manufacture) to

Answer 34

avoid its decomposition.

Question 35

Which of the following processes does not produce Cl2as a co-product during the manufacture of caustic soda ?

Answer 35

Lime-soda process