A container is divided into two parts in the ratio 1:3 by fixed semi permeable membrane (SPM) (which permits movement of $N{O}_2$ only) as shown. At temperature ‘T’ Kelvin chamber I consists of undissociated $N_2{O}_4$ at pressure of 20 mm and chamber II contains small amount of liquid $H_{2}O.$ The chambers are now heated to the temperature ‘1.2T’ Kelvin at which $N_2{O}_4$ dissociates by 50%.

Given: The vapour pressure of water at ‘T’ Kelvin 20mm of Hg and vapour pressure at ‘1.2T’ Kelvin is 30mm of Hg.
Assume $H_{2}O$ does not completely evaporate at ‘T’ or ‘1.2T’ Kelvin.
Calculate abcd where
ab=two digit number representing pressure (in mm) in chamber I at ‘1.2T’ Kelvin
cd=two digit number representing pressure (in mm) in chamber II at ‘1.2T’ Kevin.
(abcd is a four digit number with digits a,b,c,d)