Answer:
(a, b, c) Hardness of
water is due to presence of following salts:
\[Ca{{(HC{{O}_{3}})}_{2}};Mg{{(HC{{O}_{3}})}_{2}},CaC{{l}_{2}};MgC{{l}_{2}};\]\[CaS{{O}_{4}};MgS{{O}_{4}};\]
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