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Standard XII

Chemistry

Preparations and Uses of Sodium Carbonate

A colourless ...

Question

A colourless solid $(X)$ on heating evolved $C O_{2}$ and also gave a white residue, soluble in water. Residue also gave $C O_{2}$ when treated with dilute acid. $(X)$ is:

N a_{2} C O_{3}

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C a C O_{3}

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

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N a H C O_{3}

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Solution

The correct option is D $N a H C O_{3}$
$2 N a H C O_{3} Δ - \to N a_{2} C O_{3} + H_{2} O + C O_{2}$

$N a_{2} C O_{3} H + - - \to produces C O_{2}$

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A colourless solid (X) on heating evolved CO2 and also gave a white residue, soluble in water. Residue also gave CO2 when treated with dilute acid. (X) is:

The correct option is D NaHCO32NaHCO3Δ−→Na2CO3+H2O+CO2 Na2CO3H+−−→produces CO2

A colourless solid $(X)$ on heating evolved $C O_{2}$ and also gave a white residue, soluble in water. Residue also gave $C O_{2}$ when treated with dilute acid. $(X)$ is:

The correct option is D $N a H C O_{3}$
$2 N a H C O_{3} Δ - \to N a_{2} C O_{3} + H_{2} O + C O_{2}$

$N a_{2} C O_{3} H + - - \to produces C O_{2}$