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1. Which acid is formed when NO₂ dissolves in water?
A. HNO₃
B. H₂SO₃
C. H₂CO₃
D. HCl
2. Which acid is present in ant sting?
A. Acetic acid
B. Formic acid
C. Lactic acid
D. Citric acid
3. Which base is used in antacids?
A. Ca(OH)₂
B. NaOH
C. Mg(OH)₂
D. KOH
4. Which acid is called king of chemicals?
A. HCl
B. H₂SO₄
C. HNO₃
D. CH₃COOH
5. Which salt is called rock salt?
A. NaHCO₃
B. NaCl
C. KCl
D. Na₂CO₃
6. Which salt is used to melt ice on roads?
A. Na₂CO₃
B. NaCl
C. KCl
D. CaCl₂
7. Which salt is used in preparation of plaster of Paris?
A. NaCl
B. CaSO₄·½H₂O
C. CaCO₃
D. Na₂SO₄
8. Which salt is used for making statues and decorative materials?
A. Washing soda
B. Plaster of Paris
C. Bleaching powder
D. Baking soda
9. What is the chemical formula of gypsum?
A. CaSO₄·2H₂O
B. CaSO₄·½H₂O
C. CaCO₃
D. CaCl₂
10. Which salt is obtained by heating gypsum?
A. NaCl
B. Plaster of Paris
C. Bleaching powder
D. Baking soda
11. Which chemical is used in disinfecting drinking water?
A. NaCl
B. CaOCl₂
C. Na₂CO₃
D. NaHCO₃
12. Which salt gives out CO₂ when heated with acid?
A. Sodium bicarbonate
B. Sodium chloride
C. Potassium chloride
D. Calcium sulphate
13. Which base is also known as milk of magnesia?
A. Mg(OH)₂
B. Ca(OH)₂
C. NaOH
D. KOH
14. Which salt is used in cold packs?
A. NaCl
B. NH₄NO₃
C. NaHCO₃
D. CaSO₄
15. Which of the following solutions has pH less than 7?
A. NaOH
B. KOH
C. HCl
D. Ca(OH)₂
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