7(ii)
Identify the anion present in the following compounds:
(a) Compound ‘C’ on heating with dilute hydrochloric acid liberates a gas which turns lime water milky but has no effect on potassium dichromate solution.
(b) Compound ‘D’ on heating with concentrated sulphuric acid liberates a gas which when passed through silver nitrate solution gave a white precipitate, insoluble in dilute nitric acid.
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(a) Carbonate ion (CO32-) — the gas evolved is carbon dioxide, which turns lime water milky but has no effect on potassium dichromate.
(b) Chloride ion (Cl-) — the gas evolved is hydrogen chloride, which gives a white precipitate of silver chloride (insoluble in dilute nitric acid) with silver nitrate.