[AMU 2002]
A) $ N{a^{+}},\ SO_4^{2-} $
B) $ {K^{+}},\ HCO_3^{-} $
C) $ C{a^{2+}},\ NO_3^{-} $
D) $ NH_4^{+},\ C{l^{-}} $
Correct Answer: B
$ HCO_3^{-} $ is main reason of temporary hardness of water.
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