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Standard VIII

Chemistry

Evolution of Gas

A solid compo...

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}

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C a C O_{3}

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N a_{2} C O_{3}

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K_{2} C O_{3}

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Solution

The correct option is B $C a C O_{3}$
$C a C O_{3} X \to C a O r e s i d u e + C O_{2}; C a O + H_{2} O \to C a (O H)_{2} Y C a (O H)_{2} Y + 2 C O_{2} \to C a (H C O_{3})_{2}; Z C a (H C O_{3})_{2} Z boiling ⟶ C a C O_{3} X + H_{2} O + C O_{2}$

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A solid compound X on heating gives CO2 gas and a residue. The residue mixed with water forms Y. On passing an excess of CO2 through Y in water a clear solution Z is obtained. On boiling Z, compound X is reformed. The compound X is:

The correct option is B CaCO3CaCO3X→CaOresidue+CO2;CaO+H2O→Ca(OH)2YCa(OH)2Y+2CO2→Ca(HCO3)2;ZCa(HCO3)2Zboiling⟶CaCO3X+H2O+CO2

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:

The correct option is B $C a C O_{3}$
$C a C O_{3} X \to C a O r e s i d u e + C O_{2}; C a O + H_{2} O \to C a (O H)_{2} Y C a (O H)_{2} Y + 2 C O_{2} \to C a (H C O_{3})_{2}; Z C a (H C O_{3})_{2} Z boiling ⟶ C a C O_{3} X + H_{2} O + C O_{2}$