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JEE Advanced levelSingle correct optionDifficulty 3 of 3sb163

A sample of impure limestone loses on strong heating (only decomposes; the impurities are inert and non-volatile). All the quicklime obtained is slaked with excess water. Molar masses: 100, 56, 74 g/mol. The mass of formed is:

  1. A
  2. B
  3. C
  4. D

Answer: C

: 9.68 g is 9.68/44 = 0.22 mol, so 0.22 mol forms. then gives 0.22 mol, i.e. 0.22 74 = 16.28 g. Assuming the sample were pure limestone would wrongly give 18.50 g.
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