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

Question

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 (A) Ca(HCO3)2  (B) CaCO3  (C) NaHCO3  (D) Na2 CO3

Tardigrade Admin · Accepted Answer

undersetXCaCO3 ->[ textHeat] CaO + underset textColourless gasCO2 uparrow underset textResidueCaO +H2O → undersetYCa(OH)2 undersetZCa(HCO3)2 ->[ textHeat] undersetXCaCO3 +CO2 uparrow +H2O

Q. A compound $X$ on heating gives a colourless gas. The residue is dissolved in water to obtain $Y$ . Excess $C O_{2}$ is passed through aqueous solution of $Y$ when $Z$ is formed. $Z$ on gentle heating gives back $X$ . The compound $X$ is

$C a (H C O_{3})_{2}$

$CaCO X_{3}$

$N a H C O_{3}$

$N a_{2} C O_{3}$

$X C a C O_{3} Heat C a O + Colourless<br/><br/> gas C O_{2} ↑$
$Residue C a O + H_{2} O \to Y C a (O H)_{2}$
$Z C a (H C O_{3})_{2} Heat X C a C O_{3} + C O_{2} ↑ + H_{2} O$

Q. 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

Ca(HCO3​)2​

CaCOX3​

NaHCO3​

Na2​CO3​