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\( \mathrm{RH}_{2} \) (ion exchange resin) can replace \( \mathrm{Ca}^{2+} \) in hard
P water as follows.

W
\[
\mathrm{RH}_{2}+\mathrm{Ca}^{2+} \rightarrow \mathrm{RCa}+2 \mathrm{H}^{+}
\]
One litre of hard water after passing through \( \mathrm{RH}_{2} \) has \( \mathrm{pH}=2 \). Hence, hardness in \( \mathrm{ppm} \) of \( \mathrm{Ca}^{2+} \) is
(1) 200
(2) 100
(3) 50
(4) 125
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