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Nitric Acid

Among the met...

Question

Among the metals $F e; Z n; P b; A g$ and $P t,$ which do not give a metal nitrate on treatment with concentrated $H N O_{3}$ ?

F e

and

P t

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F e

and

Z n

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F e, A g

and

P t

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P b, A g

and

P t

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Solution

The correct option is A $F e$ and $P t$

Iron and platinum will react with concentrated nitric acid, but not with highly concentrated nitric acid.That happens because very concentrated nitric acid forms a protective metal oxide layer on the surface of the metal atom , which eventually stops the reaction by preventing the further oxidation of the metal. So $F e$ and $P t$ do not give a metal nitrate on treatment with concentrated $H N O_{3}$ Hence option B is correct.

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and

E_{P t / F e^{3 +}, F e^{2 +}}^{\circ} = 0.77 v o l t

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Among the metals Fe;Zn;Pb;Ag and Pt, which do not give a metal nitrate on treatment with concentrated HNO3?

Among the metals $F e; Z n; P b; A g$ and $P t,$ which do not give a metal nitrate on treatment with concentrated $H N O_{3}$ ?