Heating $(NH_4)_2Cr_2O_7$ liberates a gas. The same gas is obtained by:

  • A
    Heating $NH_4NO_2$
  • B
    Treating $H_2O_2$ with $NaNO_2$
  • C
    Treating $Mg_3N_2$ with $H_2O$
  • D
    Heating $NH_4NO_3$

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