Identical mineral of calcium and magnesium ions is :

Q. Hardness to water is caused by the presence of calcium $\left(C{a}^{2+}\right)$ and magnesium $\left(M{g}^{2+}\right)$ ions. Which are the least soluble forms of calcium and magnesium at normal water temperature ?

Q.

Which of the following is a mineral required by our body?

Calcium, Phosphorus, Iodine, Potassium, Magnesium, Iron

Q. Assertion :Scum is formed when hard water is treated with soap. Reason: Hard water contains calcium and magnesium ions. When soap comes in contact with hard water, these ions form calcium and magnesium salts of fatty acids which are insoluble in water. These calcium or magnesium salts precipitate out in the form of scum.

Q. In a permutit, the calcium and magnesium ions of hard water are exchanged by:

Q. Soaps do not work with hard water containing calcium and magnesium ions because: