List of top Chemistry Questions on Balancing a redox reaction asked in BITSAT

Balance the following redox reaction in acidic medium and determine the stoichiometric coefficient of $\text{H}_2\text{O}$ in the final balanced equation.

\[\text{MnO}_4^-(aq) + \text{Fe}^{2+}(aq) \rightarrow \text{Mn}^{2+}(aq) + \text{Fe}^{3+}(aq)\]

Using the standard electrode potential, find out the pair between which redox reaction is not feasible. The \( E^\circ \) values are: \[ {Fe}^{3+}/{Fe}^{2+} = +0.77, \quad {I}_2/{I}^- = +0.54 \] \[ {Cu}^{2+}/{Cu} = +0.34, \quad {Ag}^+/{Ag} = +0.80 \, {V} \]
$aK _{2} Cr _{2} O _{7}+ bKCl + cH _{2} SO _{4} \longrightarrow xCrO _{2} Cl _{2}+ yKHSO _{4}+ zH _{2} O$ The above equation balances when