Question

Hard water contains salt of

• A. carbon and magnesium
• B. sodium and aluminium
• C. calcium and magnesium
• D. calcium and potassium

Answer 1

The correct option is C

calcium and magnesium

Hard water

• The simple definition of the hardness of water is the amount of dissolved Calcium$\left(\mathrm{Ca}\right)$ and Magnesium$\mathrm{Mg}$ salt in the water.
• It is because hard water contains minerals from the shallow ground, such as calcium and magnesium.

So, Hard water contains a salt of calcium and magnesium.

Therefore, the correct answer is option C calcium and magnesium