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  • The standard electrode potential <img alt="\left(\mathrm{M}^{3+} / \mathrm{M}^{2+}\right)" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cleft%28%5Cmathrm%7BM%7D%5E%7B3&plus;%7D%2

The standard electrode potential \left(\mathrm{M}^{3+} / \mathrm{M}^{2+}\right) 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 H_{2} from a dilute acid are 

Option: 1

\mathrm{Mn}^{2+}$ and $\mathrm{Co}^{2+}


Option: 2

\mathrm{Cr}^{2+}$ and $\mathrm{Co}^{2+}


Option: 3

\mathrm{V}^{2+}$ and $\mathrm{Cr}^{2+}


Option: 4

\mathrm{V}^{2+}$ and $\mathrm{Mn}^{2+}


Answers (1)

best_answer

V^{+2} and Cr^{+2}
The metal ion for which have less value of reduction potential can release H_{2} on reaction with dilute acid.

Posted by

Shailly goel

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