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Question

Number of moles of CaO required to remove hardness from 1000 litre water having 324 ppm of calcium bicarbonate.

A
8
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B
4
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C
3
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D
2
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Solution

The correct option is D 2
Ca(HCO3)2+CaO2CaCO3+H2O.

Molecular weight of Ca(HCO3)2 =162 gms

Moles of Ca(HCO3)2=324162=2

From the reaction, it is clear that 1 mole of CaO is required for one mole of calcium bicarbonate, thus for 2 moles of calcium bicarbonate, we require 2 moles of CaO.

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