Question:
Identify the pair of chlorides responsible for permanent hardness of water.
Identify the pair of chlorides responsible for permanent hardness of water.
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Permanent hardness is caused by chlorides and sulphates of calcium and magnesium.
Updated On: May 7, 2026
- \(NaCl,\ KCl\)
- \(CaCl_2,\ KCl\)
- \(AlCl_3,\ MgCl_2\)
- \(MgCl_2,\ CaCl_2\)
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The Correct Option is D
Solution and Explanation
Step 1: Permanent hardness of water is caused by soluble salts of calcium and magnesium.
Step 2: Chlorides and sulphates of calcium and magnesium cause permanent hardness.
Step 3: The important chloride salts responsible for permanent hardness are: \[ MgCl_2 \] and \[ CaCl_2 \]
Step 4: Sodium chloride and potassium chloride do not cause hardness because \(Na^+\) and \(K^+\) are not hardness-producing ions. \[ \boxed{MgCl_2,\ CaCl_2} \]
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