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Hardness of Water and Treatment

Permanent har...

Question

Permanent hardness can be removed by adding:

{C l}_{2}

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{N a}_{2} C O_{3}

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C a (O C l) C l

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K_{2} C O_{3}

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Solution

The correct option is B ${N a}_{2} C O_{3}$
Permanent hardness is removed by precipitating carbonates of ${C a}^{2 +}$ and ${M g}^{2 +}$ .
$C a {C l}_{2} + {N a}_{2} C O_{3} ⟶ C a C O_{3} ↓ + 2 N a C l$

$M g {C l}_{2} + {N a}_{2} C O_{3} ⟶ M g C O_{3} ↓ + 2 N a C l$

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Similar questions

Permanent hardness of water can be removed by adding ____.

C a S O_{4}

C a C O_{3}

N a_{2} C O_{3}

N a_{2} C O_{3}

C a C O_{3}

x

x

(N a P O_{3})_{6}

C l^{⊝}

S O_{4}^{2 -}

M g^{2 +}

C a^{2 +}

N a_{2} C O_{3}

C a S O_{4} + N a_{2} C O_{3} \to C a C O_{3} + N a_{2} S O_{4}

C a C l_{2} + N a_{2} C O_{3} \to C a C O_{3} + 2 N a C l

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