4(iii)
Name the gas produced during each of the following reactions:
(a) When copper is treated with hot, concentrated nitric acid.
(b) When ammonia is burnt in an atmosphere of oxygen.
(c) When ferrous sulphide reacts with dilute hydrochloric acid.
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(a) Nitrogen dioxide (NO2)
(b) Nitrogen (N2)
(c) Hydrogen sulphide (H2S)