Question

i. While studying the combination reaction on adding water to quick lime, name the product formed and write its colour.
ii. While studying the decomposition reaction by heating ferrous sulphate crystals in a test tube, a product is formed in the test tube. Name the product and write its colour.

Answer 1

i. Calcium oxide (quick lime) reacts with water to form calcium hydroxide (slaked lime) which is white in colour.
ii. When green coloured ferrous sulphate crystals are heated, the residue of ferric oxide is formed which is brown black in colour.