Q.

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

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a

V2+ and Mn2+

b

V2+ and Cr2+

c

Mn2+ and Co2+

d

Cr2+ and Co2+

answer is A.

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m+3/m+2  given –ve SRP

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