Which of the following statements regarding $H_2O_2$ is correct?

  • A
    It is prepared by electrolysis of dil. $H_2SO_4$.
  • B
    The bleaching action of $H_2O_2$ is temporary.
  • C
    It can be concentrated by boiling.
  • D
    The speed of decomposition of $H_2O_2$ can be retarded by using urea.

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