One mole of n,o, is heated in a sealed tube upto a certain temperature. when the n,o, is half dissociated into no,, the ratio of partial pressures of n,o,: no,

One mole of N,O, is heated in a sealed tube upto a certain temperature. When the N,O, Is half dissociated into NO,, the ratio of partial pressures of N,O,: NO, is: (A) 4:1 (B) 2:1 (C) 1:1 (D) 1:2