Which of the following has least tendency to liberate $\mathrm{H}_{2}$ from mineral acids?

JEE Main · 2022 · 28 Jul 2022 · Shift 1 · Redox Reactions and Electrochemistry

Which of the following has least tendency to liberate

H_{2}

from mineral acids?

(A)Cu✓ Correct
(B)Mn
(C)Ni
(D)Zn

Answer: (A)

Solution

Copper (Cu) is the least electropositive among the given metals and lies below hydrogen in the electrochemical series (reactivity series). Metals below hydrogen cannot displace

H_{2}

from acids. Mn, Ni, and Zn are all above hydrogen in the series and can liberate

H_{2}

from mineral acids.

JEE Main · 2022 · 28 Jul 2022 · Shift 1 · Single correct option

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