JEE Main Chemistry question

Chemistry Solutions JEE Main

The hardness of water sample containing 0.002 mole of magnesium sulphate dissolved in a litre of water is expressed as [Kerala CEE 2007]

(A)20ppm
(B)200ppmCorrect
(C)2000ppm
(D)120ppm

Answer: (B)

Solution

0.002 mol MgSO in 1 L has mass g/L, i.e. 0.24 g of MgSO per g of water, so g of water contains g of MgSO. Converting to

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Question ID VK-137231