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’ ?

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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 CO2 is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A?

The correct option is C Ca(OH)2Ca(OH)2(A)+Na2CO3→CaCO3+2NaOHCa(OH)2+CO2→CaCO3+H2O Ca(OH)2 is used to remove temporary hardness in Clark's method.

Chemical $A$ is used for water softening to remove temporary hardness. $A$ reacts with sodium carbonate to generate caustic soda. When $C O_{2}$ is bubbled through a solution of $A$ , it turns cloudy. What is the chemical formula of $A$ ?

The correct option is C $C a (O H)_{2}$
$C a (O H)_{2} (A) + N a_{2} C O_{3} \to C a C O_{3} + 2 N a O H C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$
$C a (O H)_{2}$ is used to remove temporary hardness in Clark's method.