500 mL of $1.2$ M KI solution is mixed with 500 mL of $0.2$ M $ \mathrm{KMnO_4} $ solution in basic medium. The liberated iodine is titrated with standard $0.1$ M $ \mathrm{Na_2S_2O_3} $ solution in the presence of starch indicator till the blue colour disappears. The volume (in L) of $ \mathrm{Na_2S_2O_3} $ consumed is ________ (nearest integer).

Question

Consider following reaction :
$Fe(OH)_2 + 2e^- \rightarrow Fe(s) + 2OH^-$ , $E^{\circ} = -0.88 \text{ V}$
$AgBr(s) + e^- \rightarrow Ag(s) + Br^-(aq)$ , $E^{\circ} = 0.07 \text{ V}$
Select the correct statement.
(1) $E^{\circ}_{cell} = -0.95 \text{V}$
(2) $E^{\circ}_{cell}$ is an extensive property
(3) $Fe$ is getting reduced
(4) Net cell reaction: $Fe(s) + 2OH^-(aq) + 2AgBr(s) \rightarrow Fe(OH)_2 + 2Ag(s) + 2Br^-(aq)$

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Correct Answer: 3

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