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Question

Concentration of H2O2 by vacuum distillation gives hydrogen peroxide which is:
  1. about 99% pure
  2. about 90% pure
  3. 30% pure
  4. about 50% pure

A
about 90% pure
B
about 99% pure
C
30% pure
D
about 50% pure
Solution
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Vacuum distillation avoids decomposition of peroxide and gives crystalline H2O2 with negligible amount of impurities.

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