Name (a) a black metallic oxide which reacts with hydrochloric acid to give a coloured solution. (b) two colourless gases, which when mixed produce a white solid. (c) two gases which chemically combine to form a liquid. (d) a chloride which is soluble in excess of ammonium hydroxide. (e) the chemical in which gold can be dissolved. (f) the experiment which demonstrates that hydrogen chloride is soluble in water. (g) the gas produced when chlorine water is exposed to sunlight.
When a mixture of hydrogen and chlorine is exposed to sunlight, the greenish-yellow color of chlorine disappears. Give reason.