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Calcium and Its Compounds

In natural wa...

Question

In natural water, hardness is mainly caused by

C a^{+ +}

and

M g^{+ +}

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N a^{+ +}

and

K^{+ +}

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C a^{+ +}

and

F e^{+ +}

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C a^{+ +}

and

M n^{+ +}

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Solution

The correct option is A $C a^{+ +}$ and $M g^{+ +}$
Hardness is due to polyvalent metallic cations and is generally due to $C a^{+ +}$ and $M g^{+ +}$ as these are most commonly present in water.

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Which of the following cause alkalinity as well as hardness in natural water?

0.25

M g C l_{2}

25

C a C O_{3}

0.25

C a C O_{3}

1

C a C O_{3}

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