3(ii)
Give reasons:
(a) When ammonia gas is passed over black copper oxide in a combustion tube a reddish-brown substance is left behind.
(b) Quick lime is not used to dry hydrogen chloride gas.
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(a) When ammonia gas is passed over black copper oxide in a combustion tube a reddish-brown substance is left behind because ammonia gas reduces black copper [II] oxide to brown Copper.
2NH3 + 3CuO ⟶ 3Cu + 3H2O + N2 ↑
(b) Quick lime is not used to dry hydrogen chloride gas because quick lime reacts with hydrogen chloride gas