Chemical process

1

High purity nitrogen is used in

A. making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils
B. fire fighting purposes
C. both (a) & (b)
D. neither (a) nor (b).

2

Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process ?

A. NH3
B. NaCl
C. CaO
D. Coke

3

Fat splitting catalyst is

A. CaCO3
B. ZnO
C. Al2O3
D. Fe

4

Main constituent of limestone is

A. CaCO3
B. MgCO3
C. Na2CO3
D. CaSO4

5

In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because

A. SO3 gas is sparingly soluble in water
B. water forms an acid mist, which is difficult to absorb
C. the purity of acid is affected
D. scale formation in the absorber is to be avoided.