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Standard XII

Chemistry

Hardness of Water and Treatment

Chemical ‘A’ ...

Question

Chemical ‘A’ is used for water softening to remove temporary hardness. ‘A’ reacts with sodium carbonate to generate caustic soda. When carbon dioxide is bubbled through ‘A’, it turns cloudy. What is the chemical formula of ‘A’ ?

$C a C O_{3}$

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$C a O$

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$C a (O H)_{2}$

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

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Solution

The correct option is C
$C a (O H)_{2}$

$N a_{2} C O_{3} + C a (O H)_{2} \to 2 N a O H + C a C O_{3} C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$

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Chemical ‘A’ is used for water softening to remove temporary hardness. ‘A’ reacts with sodium carbonate to generate caustic soda. When carbon dioxide is bubbled through ‘A’, it turns cloudy. What is the chemical formula of ‘A’ ?

The correct option is C Ca(OH)2 Na2CO3+Ca(OH)2→2NaOH+CaCO3Ca(OH)2+CO2→CaCO3+H2O

The correct option is C
$C a (O H)_{2}$

$N a_{2} C O_{3} + C a (O H)_{2} \to 2 N a O H + C a C O_{3} C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$