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MCQ : Hard water contains an appreciable amount of concentration of which ions?

Expert Answer​

Answer

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Question

Hard water contains an appreciable amount of concentration of which ions?

  1. Cl– and NO3–
  2. Na+ and K+
  3. CO32- and Cl–
  4. Ca2+, Fe2+ and Mg2+

Answer

Ca2+, Fe2+ and Mg2+

Explanation

Hard water contains an appreciable amount of concentration of calcium ions (Ca2+), magnesium ions (Mg2+), and sometimes iron ions (Fe2+).

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