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  • A compound  on heating gives a colourless gas which is not supporter of combustion. The residue i

A compound \mathrm{X} on heating gives a colourless gas which is not supporter of combustion. The residue is dissolved in water and excess of \mathrm{CO}_{2} is passed through it. Compound \mathrm{Y} is formed, which is recovered in the solid form. Y on gentle heating gives back \mathrm{X}.The compound \mathrm{X} can be      

Option: 1

\mathrm{CaCO}_{3}


Option: 2

\mathrm{NaNO}_{3}


Option: 3

\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}


Option: 4

\mathrm{K}_{2} \mathrm{CO}_{3}


Answers (1)

best_answer

\mathrm{CaCO}_{3}+$ Heat $\rightarrow \mathrm{CaO}+\mathrm{CO}_{2}

\mathrm{CaO}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Ca}(\mathrm{OH})_{2}

\mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{CO}_{2} \rightarrow \mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}

\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}+$ Heat $\rightarrow \mathrm{CaCO}_{3}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}

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Rishi

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