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Q.

The standard electrode potential (M3+/M2+) for V, Cr, Mn & Co are -0.26V, -0.41V, +1.57V and +1.97V, respectively. The metal ions which can liberate H2 from a dilute acid are.

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a

V2+

b

Mn2+

c

Co2+

d

Cr+2

answer is A, D.

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Detailed Solution

m+3/m+2 given negative SRP

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