Addition of which of the following material to water does not make it hard?

{M g}_{3} {(P O_{4})}_{2}

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F e {(N O_{3})}_{3}

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V {(N O_{3})}_{3}

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T i {(C l O_{4})}_{4}

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Solution

The correct option is A ${M g}_{3} {(P O_{4})}_{2}$
${M g}_{3} {(P O_{4})}_{2}$ is insoluble in water. So, it does not make water hard but all other ions are soluble in water and so, they make water hard.

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Addition of which of the following material to water does not make it hard?

The correct option is A Mg3(PO4)2Mg3(PO4)2 is insoluble in water. So, it does not make water hard but all other ions are soluble in water and so, they make water hard.

The correct option is A ${M g}_{3} {(P O_{4})}_{2}$
${M g}_{3} {(P O_{4})}_{2}$ is insoluble in water. So, it does not make water hard but all other ions are soluble in water and so, they make water hard.