Pure $HNO_3$ is a colorless liquid,but it turns light brown in the presence of light. This is due to its decomposition into which of the following substances in small amounts?

  • A
    $NO, NO_2$
  • B
    $NO_2, O_2$
  • C
    $NO, O_2$
  • D
    $N_2O_5, O_2$

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