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Assertion: Permanent hardness of water is removed by treatment with washing soda.
Reason: Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates.
Options:
Reason: Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates.
Solution:
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Verified Answer
The correct answer is:
If both assertion and reason are true and reason is the correct explanation of assertion.
$\begin{aligned}
& \mathrm{MCl}_2+\mathrm{Na}_2 \mathrm{CO}_3 \rightarrow \mathrm{MCO}_3 \downarrow+2 \mathrm{NaCl} \\
& \mathrm{MSO}_4+\mathrm{Na}_2 \mathrm{CO}_3 \rightarrow M \mathrm{MO}_3 \downarrow+\mathrm{Na}_2 \mathrm{SO}_4
\end{aligned}$
(where, $M=\mathrm{Mg}, \mathrm{Ca}$ )
& \mathrm{MCl}_2+\mathrm{Na}_2 \mathrm{CO}_3 \rightarrow \mathrm{MCO}_3 \downarrow+2 \mathrm{NaCl} \\
& \mathrm{MSO}_4+\mathrm{Na}_2 \mathrm{CO}_3 \rightarrow M \mathrm{MO}_3 \downarrow+\mathrm{Na}_2 \mathrm{SO}_4
\end{aligned}$
(where, $M=\mathrm{Mg}, \mathrm{Ca}$ )
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