Identify the anion present in the following compounds: Compound Z which on reacting with dilute sulphuric acid liberates a gas which turns lime water milky, but the gas has no effect on acidified potassium dichromate solution.
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Solution
The compound Z is Na2CO3.It reacts with dil.H2SO4 and liberates a colourless gas which does affect potassium dichromte solution. The gas evolved is carbon dioxide. Hence, carbonate radical may be present.