On electrolysis of dilute H2SO4 using platinum electrodes, the gas evolved at the anode is:

Question

On electrolysis of dilute H2SO4 using platinum electrodes, the gas evolved at the anode is: (A) O2 (B) H2 (C)  SO2 (D)  SO3

Tardigrade Admin · Accepted Answer

During electrolysis of dilute H 2 SO 4 using platinum electrodes, the oxygen gas is evolved at the anode and hydrogen is liberated at cathode. At cathode: H++e- arrow (1/2) H2 At anode: 2 H2 O(l) arrow O2(g)+4 e- ; Δ Eo=+1.23 V(I) 2 S O42-(aq) arrow S2 O82-+2 e- ; E=+1.96 V(II) For dilute solution reaction (l) is preferred and O2 liberates at anode but at higher concentration reaction (II) is preferred.

Q. On electrolysis of dilute $H_{2} S O_{4}$ using platinum electrodes, the gas evolved at the anode is:

$O_{2}$

$H_{2}$

$S O_{2}$

$S O_{3}$

Q. On electrolysis of dilute H2​SO4​ using platinum electrodes, the gas evolved at the anode is:

O2​

H2​

SO2​

SO3​

Q. On electrolysis of dilute $H_{2} S O_{4}$ using platinum electrodes, the gas evolved at the anode is:

$O_{2}$

$H_{2}$

$S O_{2}$

$S O_{3}$