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The metal salts formed during softening of hardwater using Clark's method are

Options

  1. ACa OH 2 and Mg OH 2
  2. BCaCO 3 and Mg OH 2
  3. CCa OH 2 and MgCO 3
  4. DCaCO 3 and MgCO 3

Correct answer

B. CaCO 3 and Mg OH 2

Step-by-step solution

Clark's method: In this method calculated amount of lime is added to hard water. It precipitates out calcium carbonate and magnesium hydroxide which can be filtered off. Clark's Method Reaction Ca HCO 3 2 + Ca OH 2 → 2 CaCO 3 + 2 H 2 O Mg HCO 3 2 + 2 Ca OH 2 → 2 CaCO 3 + Mg OH 2 + 2 H 2 O

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