5. Slaking of lime is (i) An endothermic reaction (ii) An exothermic reaction (iii) A combination reaction (iv) A decomposition reaction. A) (i) & (iii) B) (i) & (iv) C) (ii) & (iii) D) (ii) & (iv) 6. The oxidation number of sulphur in sulphuric acid is A) 2 B) 4 C) 3 D) 6 7. A copper vessel acquires a green coloured coating when kept in moist air for a few days. The green coloured subs†an ce is chemically A) Acidic copper oxide B) Basic copper sulphate C) Hydrated copper sulphate D) Basic copper carbonate.

5. Slaking of lime is (i) An endothermic reaction (ii) An exothermic

1.	5. Slaking of lime is (i) An endothermic reaction (ii) An exothermic reaction (iii) A combination reaction (iv) A decomposition reaction. A) (i) & (iii) B) (i) & (iv) C) (ii) & (iii) D) (ii) & (iv) 6. The oxidation number of sulphur in sulphuric acid is A) 2 B) 4 C) 3 D) 6 7. A copper vessel acquires a green coloured coating when kept in moist air for a few days. The green coloured subs†an ce is chemically A) Acidic copper oxide B) Basic copper sulphate C) Hydrated copper sulphate D) Basic copper carbonate.
Answer» 5. Slaking of lime is (i) An endothermic reaction (ii) An exothermic reaction (iii) A combination reaction (iv) A decomposition reaction. A) (i) & (iii) B) (i) & (iv) C) (ii) & (iii) D) (ii) & (iv) 6. The oxidation number of sulphur in sulphuric acid is A) 2 B) 4 C) 3 D) 6 7. A copper vessel acquires a green coloured coating when kept in moist air for a few days. The green coloured subs†an ce is chemically A) Acidic copper oxide B) Basic copper sulphate C) Hydrated copper sulphate D) Basic copper carbonate.