A solid compound X on heating gives C O 2 gas and a residue. The residue mixed with water forms Y. On passing an excess of C O 2 through Y in water, a clear solution Z is obtained. On boiling Z, compound X is reformed. The compound X is

Question

A solid compound X on heating gives C O 2 gas and a residue. The residue mixed with water forms Y. On passing an excess of C O 2 through Y in water, a clear solution Z is obtained. On boiling Z, compound X is reformed. The compound X is, C a H C O 3 2, C a C O 3, N a 2 C O 3, K 2 C O 3

MARKS App · Accepted Answer

The given compound X must be C a C O 3 . It can be explained by following reaction C a C O 3 → Δ C a O + C O 2 ↑ C a O + H 2 O → C a O H 2 Y C a O H 2 + 2 C O 2 + H 2 O → C a H C O 3 2 Z C a H C O 3 2 → Δ C a C O 3 X + C O 2 ↑ + H 2 O

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