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Standard X

Chemistry

Bleaching Powder

A compound ...

Question

A compound $X$ on heating gives a colourless gas. The residue is dissolved in water to obtain $Y$ . Excess $C O_{2}$ is bubbled through an aqueous solution of $Y, Z$ is formed. $Z$ on gently heating gives back $X$ . The compound $X$ is:

C a C O_{3}

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N a_{2} C O_{3}

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

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K_{2} C O_{3}

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Solution

The correct option is A $C a C O_{3}$
${C a C O}_{3} Δ - \to C a O + {C O}_{2} X Y C a O + H_{2} O \to C a {(O H)}_{2} + {C O}_{2} \to {C a C O}_{3} + H_{2} O Z$

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A compound $X$ on heating gives a colourless gas. The residue is dissolved in water to give $Y$ . To the aqueous solution of $Y$ , $C O_{2}$ is passed and it produces $Z$ , which on gentle heating gives back $X$ . Compound $X$ is:

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A compound X on heating gives a colourless gas. The residue is dissolved in water to obtain Y. Excess CO2 is bubbled through an aqueous solution of Y,Z is formed. Z on gently heating gives back X. The compound X is:

The correct option is A CaCO3CaCO3Δ−→CaO+CO2X YCaO+H2O→Ca(OH)2+CO2→CaCO3+H2OZ

A compound $X$ on heating gives a colourless gas. The residue is dissolved in water to obtain $Y$ . Excess $C O_{2}$ is bubbled through an aqueous solution of $Y, Z$ is formed. $Z$ on gently heating gives back $X$ . The compound $X$ is:

The correct option is A $C a C O_{3}$
${C a C O}_{3} Δ - \to C a O + {C O}_{2} X Y C a O + H_{2} O \to C a {(O H)}_{2} + {C O}_{2} \to {C a C O}_{3} + H_{2} O Z$