What will be the hardness of $10^{5}$ grams water sample containing 16.2 grams of Ca( ${H C O}_{3}$ ) $_{2}$ ?

200 ppm

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300 ppm

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60 ppm

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100 ppm

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Solution

The correct option is D
100 ppm

$10^{5}$ grams of water contains 16.2 g of Ca( ${H C O}_{3}$ ) $_{2}$ = 10g of ${C a C O}_{3}$

$10^{6}$ grams of water contains162g of Ca( ${H C O}_{3}$ ) $_{2}$ = 100g ${C a C O}_{3}$ = 100ppm

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What will be the hardness of 105 grams water sample containing 16.2 grams of Ca(HCO3)2?

The correct option is D 100 ppm 105grams of water contains 16.2 g of Ca(HCO3)2= 10g of CaCO3 106grams of water contains162g of Ca(HCO3)2 = 100g CaCO3 = 100ppm

What will be the hardness of $10^{5}$ grams water sample containing 16.2 grams of Ca( ${H C O}_{3}$ ) $_{2}$ ?

The correct option is D
100 ppm

$10^{5}$ grams of water contains 16.2 g of Ca( ${H C O}_{3}$ ) $_{2}$ = 10g of ${C a C O}_{3}$

$10^{6}$ grams of water contains162g of Ca( ${H C O}_{3}$ ) $_{2}$ = 100g ${C a C O}_{3}$ = 100ppm