Question

Identify only the anion present in the following compound:

The compound, on heating, produces a colourless, odourless gas which turns lime water milky and has no effect on acidified potassium dichromate solution.

Answer 1

The anion present is carbonate \[\ce{CO_3^{2−}}\]. Heating the appropriate component causes \[\ce{CO2}\] to be released, turning lime water milky and not affecting acidified potassium dichromate solutions.