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Standard XII

Chemistry

Hardness of Water and Treatment

Chemical A is...

Question

Chemical A is used for softening of water to remove temporary hardness. A reacts with sodium carbonate to produce caustic soda, when $C O_{2}$ is bubbled through 'A', it turns cloudy. Chemically 'A' is:

C a O

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C a C O_{3}

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

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C a (O H)_{2}

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Solution

The correct option is D $C a (O H)_{2}$
$C a (O H)_{2}$ is used to remove temporary hardness of water.
$C a (O H)_{2} + C a (H C O_{3})_{2} \to 2 C a C O_{3} ↓ + 2 H_{2} O$
$C a (O H)_{2} + N a_{2} C O_{3} \to C a C O_{3} + 2 N a O H$
$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$
(Cloudy solution)
Hence, option D is correct

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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 $C O_{2}$ is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A

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C O_{2}

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(A)

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Chemical A is used for softening of water to remove temporary hardness. A reacts with sodium carbonate to produce caustic soda, when CO2 is bubbled through 'A', it turns cloudy. Chemically 'A' is:

The correct option is D Ca(OH)2Ca(OH)2 is used to remove temporary hardness of water.Ca(OH)2+Ca(HCO3)2→2CaCO3↓+2H2OCa(OH)2+Na2CO3→CaCO3+2NaOHCa(OH)2+CO2→CaCO3+H2O (Cloudy solution)Hence, option D is correct

Chemical A is used for softening of water to remove temporary hardness. A reacts with sodium carbonate to produce caustic soda, when $C O_{2}$ is bubbled through 'A', it turns cloudy. Chemically 'A' is: