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Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to

Options

  1. ACaCO 3 and Mg OH 2
  2. BCaCO 3 and MgCO 3
  3. CCa OH 2 and MgCO 3
  4. DCa OH 2 and Mg OH 2

Correct answer

A. CaCO 3 and Mg OH 2

Step-by-step solution

During boiling Mg HCO 3 2 is converted to insoluble Mg OH 2 Mg HCO 3 2 → Boiling Mg OH 2 ↓ + 2 CO 2 Ca HCO 3 2 → boiling CaCO 3 ↓ + H 2 O + CO 2 Ca HCO 3 2 changes to insoluble CaCO 3 Mg(OH) 2​ is less soluble than MgCO 3. Hence, the products formed are CaCO 3 and Mg(OH) 2 .​

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