Q. 5
for some half cell reactions are given below. On the basis of these mark the correct answer.
(a) 
(b) 
(c) 
A. In dilute sulphuric acid solution, hydrogen will be reduced at the cathode.
B. In concentrated sulphuric acid solution, water will be oxidised at anode.
C. In dilute sulphuric acid solution, SO42– ion will be oxidised to tetrathionate ion at anode.
D. In dilute sulphuric acid solution, water will be oxidised at anode.
Answer :
In dilute sulphuric acid solution, hydrogen will be reduced at the cathode
and H2O is oxidized at anode.
2H2O → O2 + 4H+ + 4e-
while in a concentrated solution of sulphuric acid, SO2- ions are oxidized to tetrathionate ions.
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