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Q.

RH2 (ion exchange resin) can replace Ca2+ in hard water RH2+Ca2+⟶RCa+2H+I L of hard water after passing through RH2 has pH 2.Hence, hardness in ppm of Ca2+ is:

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a

200

b

100

c

50

d

125

answer is A.

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Detailed Solution

RH2+Ca2+⟶RCa+2H+Energy Ca2+ ion is replaced by two H+ ionspH = 2∴     H+=10−2M∴ Ca2+=10−22M=10−2×402g L−1∴ ppm of Ca2+=10−2×40×1062×103Ca2+=200
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