Which of the following reactions is an example of roasting?
Nature of two oxides of nitrogen $X$ and $Y$ formed in the reaction of sodium nitrite with hydrochloric acid is
$$ \text { Match the following } $$
$$ \begin{array}{cccc} \hline & \begin{array}{c} \text { List-I } \\ \text { (Transition metal, M) } \end{array} & & \begin{array}{c} \text { List-II } \\ \left(E_{M^{2+} / M}^{\ominus}\right) \end{array} \\ \hline \text { (A) } & \mathrm{Ni} & \text { (I) } & -1.18 \\ \hline \text { (B) } & \mathrm{Mn} & \text { (II) } & -0.91 \\ \hline \text { (C) } & \mathrm{Fe} & \text { (III) } & -0.25 \\ \hline \text { (D) } & \mathrm{Cr} & \text { (IV) } & -0.44 \\ \hline \end{array} $$
The correct answer is
Identify the complex ion with spin only magnetic moment of 4.90 BM .
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