• # question_answer Which of the following pollutant increases the hardness of water? A)  ${{H}_{2}}S{{O}_{4}}$        B)  DDT C)  Pb D)                     Cu.

Correct Answer: A

Solution :

[a] Sulfuric acid is a highly corrosive strong mineral acid with the molecular formula ${{H}_{2}}S{{O}_{4}}.$It is a pungent-ethereal, colourless to slightly yellow viscous liquid which is soluble in water at all concentrations.

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