Experimentally it was found that a metal oxide has formula $M_{0.98}O$. Metal M, is present as $M^{2+}$and $M^{3+}$ in its oxide. Fraction of the metal which exists as $M^{3+}$ would be :

Question

$\begin{array}{1 1} (1) 7.01 \% \\ (2) 4.08\% \\ (3)6.05\% \\(4) 5.08\% \end {array}$