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NEET levelSingle correct optionDifficulty 1 of 3eq094

Hardness is expressed as ppm of $CaCO X_{3}$ (molar mass $100 g mo l^{- 1}$ ), where 1 ppm = 1 mg per litre. A water sample containing $1.0 \times 1 0^{- 3}$ mol/L of $Ca X^{2 +}$ ions (and no other hardness ions) has hardness of

A1000 ppm
B10 ppm
C40 ppm
D100 ppm

Answer: D

Each mole of

Ca X^{2 +}

is equivalent to 1 mol

CaCO X_{3}

. Mass =

1.0 \times 1 0^{- 3} \times 100

= 0.100 g/L = 100 mg/L = 100 ppm.

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