11. Which gas is recycled in the Solvay process?
A) CO₂
B) NH₃
C) H₂
D) O₂
Answer: B
12. The Contact process involves oxidation of:
A) SO₂ to SO₃
B) SO₃ to SO₂
C) S to SO₃
D) SO₂ to H₂SO₄
Answer: A
13. Which industry uses electrolysis of brine?
A) Fertilizer industry
B) Chlor-alkali industry
C) Petroleum industry
D) Cement industry
Answer: B
14. Electrolysis of brine produces:
A) NaOH, Cl₂, H₂
B) NaCl, H₂
C) Na₂CO₃, H₂
D) NaOH only
Answer: A
15. The main product of petroleum refining is:
A) Coke
B) Gasoline
C) Coal tar
D) Bitumen
Answer: B
16. Fractional distillation is used in:
A) Cement industry
B) Petroleum refining
C) Steel production
D) Glass industry
Answer: B
17. Cracking in petroleum industry converts:
A) Small hydrocarbons into larger ones
B) Large hydrocarbons into smaller ones
C) Alkanes into alcohols
D) Alkenes into alkanes
Answer: B
18. Catalytic cracking uses:
A) Heat only
B) Catalyst only
C) Heat and catalyst
D) Pressure only
Answer: C
19. The main raw material for cement is:
A) Limestone
B) Clay
C) Gypsum
D) All of these
Answer: D
20. The kiln temperature in cement manufacture is about:
A) 500°C
B) 1000°C
C) 1500°C
D) 2000°C
Answer: C