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NEETChemistryHydrogen

What makes water 'hard'?

Options

  1. APresence of dissolved gases
  2. BPresence of calcium and magnesium salts
  3. CHigh mineral content
  4. DLow pH

Correct answer

B. Presence of calcium and magnesium salts

Step-by-step solution

Water is considered 'hard' due to the presence of calcium and magnesium salts in the form of hydrogencarbonate, chloride, and sulfate.

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