1. Tardigrade
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  3. Chemistry
  4. A compound X on heating gives a colourless gas. The residue is dissolved in water to obtain Y. Excess CO2 is passed through aqueous solution of Y when Z is formed. Z on gentle heating gives back X. The compound X is

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Q. A compound $X$ on heating gives a colourless gas. The residue is dissolved in water to obtain $Y$. Excess $CO_2$ is passed through aqueous solution of $Y$ when $Z$ is formed. $Z$ on gentle heating gives back $X$. The compound $X$ is

VITEEEVITEEE 2015

Solution:

$\underset{X}{CaCO_{3}} \ce{->[{ \text{Heat}}]} CaO + \underset {\text{Colourless
gas}}{CO_{2}} \uparrow$
$\underset{\text{Residue}}{CaO} +H_{2}O \to \underset{Y}{Ca(OH)_{2}}$
$\underset{Z}{Ca(HCO_{3})_{2}} \ce{->[{ \text{Heat}}]} \underset{X}{CaCO_{3} +CO_{2}} \uparrow +H_{2}O$