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Valency and Oxidation States

Which of the ...

Question

Which of the following metals will not displace hydrogen from water?

M g

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Z n

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S n

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A g

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Solution

The correct option is D $A g$
Any element can reduce any element above it in electromechanical series.
Thus, only $A g$ does not lie below Hydrogen and so it can't reduce hydrogen.
$∴$ Answer is option $D .$

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Similar questions

L i

K

C a

N a

M g

A l

Z n

F e

P b

C u

H g

A g

(at 25^{\circ} C)

E_{A g | A g^{+}}^{\circ} : - 0.799 V; E_{H g | H g^{2 +}}^{\circ} : - 0.789 V; E_{M g | M g^{2 +}}^{\circ} : + 2.37 V;

E_{M n | M n^{2 +}}^{\circ} : + 1.18 V; E_{S n | S n^{2 +}}^{\circ} : 0.136 V

P b, A u, M g, S n, F e, A l, A g, H g, N a, Z n, C u, C a

Out of the following, which metal cannot displace hydrogen gas from dil $H C l$ or dil $H_{2} S O_{4}$ ?

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