1. Three coloured substances react with concentrated hydrochloric acid and produce a coloured gas that turns moist starch iodide paper blue black. Answer the following questions. i. Identify the gas evolved. ii. If one of the substances is black, name it. iii. The other two of the three substances are salts. Name the salts and write the chemical equations for their reaction with the acid.
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When moist starch iodide paper is held in the greenish yellow gas, it turns blue black, thereby proving that the gas is chlorine. This experiment proves that hydrochloric acid contains both hydrogen and chlorine. (a) a Black metallic oxide which reacts with hydrochloric acid to give a coloured solution.
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