Ncert Exercises & Solutions

$E_{Cell}^{°}$ of some half cell reactions are given below.

I:	\(\small\mathrm{H}^{+} (a q)+e^{-} \rightarrow \frac{1}{2} \mathrm{H}_2 (g )\quad ; \quad E_{\text {cell }}^0=0.00 \mathrm{~V} \)
II:	\(\small2 \mathrm{H}_2 \mathrm{O(l)} \rightarrow O_2 (g)+4 \mathrm{H}^{+} (a q)+4 e^{-} ; E_{\text {cell }}^{0}=1.23 \mathrm{~V} \)
III:	\(\small2 \mathrm{SO}_4^{2-} (a q) \rightarrow \mathrm{S}_2 \mathrm{O}_8^{2-} (a q)+2 e^{-}, E_{\text {cell }}^{0}=1.96 \mathrm{~V} \)

The correct statements among the following are:

a.	In dilute sulphuric acid solution, hydrogen will be reduced at cathode.
b.	In concentrated sulphuric acid solution, water will be oxidised at anode.
c.	In a dilute sulphuric acid solution, water will be oxidised at anode.
d.	In dilute sulphuric acid solution, SO₄^2- ion will be oxidised to tetrathionate ion at anode.

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)