(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 it colour.

Explanation

(i) Quicklime (CaO) reacts vigorously with water to form slaked lime `[Ca(OH)_(2)]` which is white in colour.
`underset(("Quick lime"))underset("Calcium oxide")(CaO(s))" "+" "H_(2)O(l)" "overset("Combination")rarr" "underset("(Slaked lime) (White)")underset("Calcium hydroxide")(Ca(OH)_(2)(s))`
(ii) When ferrous sulphate is heated strongle, it decomposes to form brown coloured ferric oxide and sulphur dioxide gas and sulphur trioxide gas.
`underset(("green colour"))underset("Ferrous sulphate")(2FeSO_(4)(S))" "underset("Decomposition")overset(Delta)rarr" "underset(("brown"))underset("ferric oxide")(Fe_(2)O_(3)(s)) + SO_(2)(g) + SO_(3)(g)`