When conc. $H_2SO_4$ is treated with $K_4[Fe(CN)_6]$,$CO$ gas is evolved. If dilute $H_2SO_4$ is used instead of conc. $H_2SO_4$,the gas evolved is:

  • A
    $CO$
  • B
    $HCN$
  • C
    $N_2$
  • D
    $CO_2$

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