JEE Mains Model Paper 2

On electrolysed of Aq.NaCl; NaOH, H2 is formed at cathode, Cl2 is formed at anode
pH = 12.25
∴ pOH = 1.76
∴ [OH−] = 1.74 × 102− M = [NaOH] = N
∴ wt of NaOH =

1.74×102−×40×300

1000

= 0.2088gr
w =

Ect

96500

⇒ 0.2088 =

40×C×6×60

96500

∴ C = current used = 1.4 A