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A compound 'A' on heating gives a colourless gas. The residue is dissolved in water to obtain B. Excess CO2 is passed through aqueous solution of B, when C is formed. C on gentle heating gives back A. The compound A is A. NaHCO3 B. Na2CO3 C. Ca(HCO3)2 D. CaCO3

A compound 'A' on heating gives a colourless gas. The residue is dissolved in water to obtain B. Excess CO2 is passed through aqueous solution of B, when C is formed. C on gentle heating gives back A. The compound A is
A. NaHCO3 B. Na2CO3 C. Ca(HCO3)2 D. CaCO3

Grade:Upto college level

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
3 years ago
576-470_2.PNG
Vikas TU
14149 Points
3 years ago
When a compound X, (calcium carbonate) on heating gives a colorless gas (carbon dioxide) and residue (calcium oxide) as a product then residue is dissolved in water to obtain Y (calcium hydroxide) and then excess carbon dioxide is bubbled through aqueous solution of Y (calcium hydroxide) it forms Z (calcium bicarbonate). On gentle heating, Z (calcium bicarbonate) gives back X (calcium carbonate).
When the excess carbon dioxide gas is passed through the calcium hydroxide, it turns milky first due to the formation of the calcium carbonate as a precipitate which is insoluble in water and then become colorless due to the formation of calcium bicarbonate. On passing excess of carbon dioxide gas, the colorless calcium bicarbonate is formed.
 

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