A) \[N{{a}^{+}},\ SO_{4}^{2-}\]
B) \[{{K}^{+}},\ HCO_{3}^{-}\]
C) \[C{{a}^{2+}},\ NO_{3}^{-}\]
D) \[NH_{4}^{+},\ C{{l}^{-}}\]
Correct Answer: B
Solution :
\[HCO_{3}^{-}\] is main reason of temporary hardness of water.
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