For the reduction of NO_3^ - ion in an aqueous solution E^ ^ is +0.96 ~V . Values of E^ ^ for some metal ions are given below. aligned & V^ 2+ (a q)+2 e^ - V; E^ ^ =-1.19 ~V & Fe^ 3+ (a q)+3 e^ - Fe; E^ ^ =-0.04 ~V &

Correct answer: A. V and Hg The species having less reduction potential with respect to NO_3^ - (E^ =0.96 ~V) will be oxidised by NO_3^ - ; These species are V, Fe, Hg .

JEE Advanced 2009Paper 2

Exam: JEE Advanced
Year: 2009
Paper: Paper 2
Subject: Chemistry
Chapter: Electrochemistry

JEE Advanced 2009 · Paper 2 · Chemistry · Electrochemistry

For the reduction of NO_3^ - ion in an aqueous solution E^ ^ is...

For the reduction of

\mathrm{NO}_3^{-}

ion in an aqueous solution

E^{{}^{\circ}}

+0.96 \mathrm{~V}

. Values of

E^{{}^{\circ}}

for some metal ions are given below.

\begin{aligned}& \mathrm{V}^{2+}(a q)+2 e^{-} \longrightarrow \mathrm{V}; E^{{}^{\circ}}=-1.19 \mathrm{~V}\\ & \mathrm{Fe}^{3+}(a q)+3 e^{-} \longrightarrow \mathrm{Fe}; \mathrm{E}^{{}^{\circ}}=-0.04 \mathrm{~V}\\ & \mathrm{Au}^{3+}(a q)+3 e^{-} \longrightarrow \mathrm{Au}; E^{{}^{\circ}}=+1.40 \mathrm{~V} \end{aligned}

\mathrm{Hg}^{2+}(

a q)+2 e^{-} \longrightarrow

\mathrm{Hg}

; E^{{}^{\circ}}=+0.86

\mathrm{~V}

The pair(s) of metals that is (are) oxidised by

\mathrm{NO}_3^{-}$in aqueous solution is (are)

Options

A $\mathrm{V}$ and $\mathrm{Hg}$
B $\mathrm{Hg}$ and $\mathrm{Fe}$
CFe and Au
D $\mathrm{Fe}$ and $\mathrm{V}$

Correct answer

A. $\mathrm{V}$ and $\mathrm{Hg}$

Step-by-step solution

The species having less reduction potential with respect to

\mathrm{NO}_3^{-}\left(E^{\circ}=0.96 \mathrm{~V}\right)

will be oxidised by

\mathrm{NO}_3^{-}

; These species are

\mathrm{V}, \mathrm{Fe}, \mathrm{Hg}

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