$1000 g$ aqueous solution of $C a C O_{3}$ contains $10 g$ of carbonate. Hardness of the solution is:

10 p p m

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100 p p m

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1000 p p m

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10000 p p m

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Solution

The correct option is D $10000 p p m$
Weight of solution $= 1000 g$
Weight of solute $= 10 g$
Concentration $(\frac{w}{w}) = \frac{10}{1000} \times 100 = 1$
Since
$1 % (\frac{w}{w}) = 10^{4} p p m$
concentration of ${C a C O}_{3} = 10000 p p m$

Hence, the correct option is $D$

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