Question

Which of the following salts when dissolved in water produce hard water?

• A. Calcium sulfate
• B. Magnesium bicarbonate
• C. Calcium bicarbonate
• D. All of these

Answer 1

The correct option is D

All of these

Explanation:

(D)

• Hard water is the water that contains calcium $\left(\mathrm{Ca}\right)$ and magnesium $\left(\mathrm{Mg}\right)$ salts, primarily bicarbonates $\left({{\mathrm{HCO}}_3}^{-}\right)$, chlorides $\left({\mathrm{Cl}}^{-}\right)$, and sulfates $\left({{\mathrm{SO}}_4}^{2-}\right)$ in it.
• When calcium sulfate $\left({\mathrm{CaSO}}_4\right)$, magnesium bicarbonate $\left(\text{Mg}{\left({\mathrm{HCO}}_3\right)}_2\right)$, or calcium bicarbonate $\left(\mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2\right)$ dissolved in water, hard water.
• Drinking hard water may provide some health advantages like it can protect against pancreatic cancer.

Final Answer:

Since, options (A), (B), and (C) all are correct hence, option (D) is correct anwser.