Which of the following mixture on mixing with distilled water will make the water hard?

N a_{2} S O_{4} + N a C l

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N a N O_{3} + N H_{4} N O_{3}

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M g S O_{4} + N a_{2} S O_{4}

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K C l + N a C l

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Solution

The correct option is C $M g S O_{4} + N a_{2} S O_{4}$
Hard water is due to presence of $C a^{2 +}$ and $M g^{2 +}$ .
So, option C is appropriate.

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