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JEE Main levelSingle correct optionDifficulty 2 of 3sb091

Assertion (A): Anhydrous cannot be obtained by simply heating in air. Reason (R): On heating, the hydrate undergoes hydrolysis and gives or with loss of HCl.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: A

Mg2+ is strongly polarising, so on heating the coordinated water hydrolyses the chloride, giving and finally with HCl. Dehydration must be done in a stream of dry HCl to suppress this. Both statements are true and R explains A.
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