The standard electrode potential (M3+/M2+) for V, Cr, Mn and Co are –0.26 V, –0.41 V, +1.57 V and +1.97 V, respectively. The metal ions which can liberate H2 from a dilute acid are
Select the correct option:
A
V2+ and Mn2+
B
Cr2+ and CO2+
C
V2+ and Cr2+
D
Mn2+ and Co2+
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Solution
Sol. Metal cation with $(-)$ value of reduction potential $\left(\mathrm{M}^{+3} / \mathrm{M}^{+2}\right)$ or with $(+)$ value of oxidation potential ( $\mathrm{M}^{+2} / \mathrm{M}^{+3}$ ) will liberate $\mathrm{H}_2$.
Therefore they will reduce $\mathrm{H}^{+}$
i.e. $\mathrm{V}^{+2}$ and $\mathrm{Cr}^{+2}$
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