The standard electrode potential (M3+/M2+) for V, Cr, Mn & 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 (A) V2+ abd Mn2+ (B) M

Question

The standard electrode potential (M3+/M2+) for V, Cr, Mn & 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

(A) V2+ abd Mn2+
(B) Mn2+ and Co2+
(C) Cr2+ and Co2+
(D) V2+ and Cr2+

Prashant Kotian · Accepted Answer

Correct answer: D. The metal ion for which have less value of reduction potential than ( H | H E  = 0) can release H2 on reaction with dilute acid. So, V+2 and Cr+2 reduce H+ to H2.

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