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Which of the following statements is correct?

A. The presence of different salts of \(Ca^{2+}, Mg^{2+}\) and \(Fe^{2+}\) in water is termed as hardness of water.

B. Temporary hardness is due to presence of \(Cl^{-}, NO_{3}^{-}, SO_{4}^{2-}\) salts of \(Ca^{2+}, Mg^{2+}\) and \(Fe^{2+}\) in water.

C. Permanent hardness is due to presence of \(HCO_{3}^{-}\) salts of \(Ca^{2+}, Mg^{2+}\) and \(Fe^{2+}\) in water.

D. Both hardness can be removed by simple boiling of water.

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সঠিক উত্তরঃ A. The presence of different salts of \(Ca^{2+}, Mg^{2+}\) and \(Fe^{2+}\) in water is termed as hardness of water.

Explanation: