JEE MAIN - Chemistry (2022 - 28th July Morning Shift - No. 6)
Which of the following has least tendency to liberate $$\mathrm{H}_{2}$$ from mineral acids?
Cu
Mn
Ni
Zn
Explanation
The metal atom whose oxidation potential is less than that of hydrogen can release $\mathrm{H}_{2}$ from mineral acids.
$\mathrm{E}_{\mathrm{Zn} / \mathrm{Zn}^{+2}}=0.76$
$\mathrm{E}_{\mathrm{Ni/Ni}^{+ 2}}=0.25$
$E_{M n / M n^{+2}}=1.18$
$\mathrm{E}_{\mathrm{Cu}^{\circ} / \mathrm{Cu}^{+2}}=-0.34$
$\mathrm{E}_{\mathrm{Zn} / \mathrm{Zn}^{+2}}=0.76$
$\mathrm{E}_{\mathrm{Ni/Ni}^{+ 2}}=0.25$
$E_{M n / M n^{+2}}=1.18$
$\mathrm{E}_{\mathrm{Cu}^{\circ} / \mathrm{Cu}^{+2}}=-0.34$
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