The standard reduction potentials at 298 K for the following half cells are given below: The number of metal(s) which will be oxidized by in aqueous solution is _____________ . [2023]

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Solution

Q.
The standard reduction potentials at 298 K for the following half cells are given below:

${NO}_{3}^{-} + 4 H^{+} + 3 e^{-} \to NO(g) + 2 H_{2} O$ $E^{θ} = 0.97 V$

$V^{2 +} (a q) + 2 e^{-} \to V$ $E^{θ} = - 1.19 V$

${Fe}^{3 +} (a q) + 3 e^{-} \to Fe$ $E^{θ} = - 0.04 V$

${Ag}^{+} (a q) + e^{-} \to Ag(s)$ $E^{θ} = 0.80 V$

${Au}^{3 +} (a q) + 3 e^{-} \to Au(s)$ $E^{θ} = 1.40 V$

The number of metal(s) which will be oxidized by ${NO}_{3}^{-}$ in aqueous solution is _____________ . [2023]

Ans.
(3)

${NO}_{3}^{-}$ can oxidise V, Fe and Ag.

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