Which among the following salts when dissolved in water produce hard water? a. \( \mathrm{CaSO}_...

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Which among the following salts when dissolved in water produce hard water?
a. \( \mathrm{CaSO}_{4} \)
b. \( \mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2} \)
c. \( \mathrm{CaCl}_{2} \)
d. Any of the above
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