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Hardness of Water and Treatment

Which of the ...

Question

Which of the following substance is not present in clear water?

C a {(H C O_{3})}_{2}

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M g C l_{2}

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C a S O_{4}

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C a C O_{3}

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Solution

The correct option is D $C a C O_{3}$
$C a C O_{3}$ is not present in the clear water. It attains the temporary hardness to the water.

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