Chemical process

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).

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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

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3

Fat splitting catalyst is

A. CaCO₃

B. ZnO

C. Al₂O₃

D. Fe

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4

Main constituent of limestone is

A. CaCO₃

B. MgCO₃

C. Na₂CO₃

D. CaSO₄

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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.

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