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Water Pollution

Which of the ...

Question

Which of the following is not a hard water?

Water containing CaCl₂

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Water containing dil. HCl

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Water containing MgSO₄

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None of these

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Solution

The correct option is D
None of these

Water containing $C a^{+ 2}$ , $M g^{+ 2}$ and $H^{+}$ (> $10^{- 7}$ m) is a hard water.

$H^{+}$ (aq)) + $C H_{3} C O O N a$ (aq) $⇋$ $C H_{3} C O O H$ (s) + ${N a}^{+}$ (aq)

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