Solid State Question 4
Question 4 - 31 January - Shift 2
A sample of a metal oxide has formula $M _{0.83} O _{1.00}$. The metal $M$ can exist in two oxidation states +2 and +3. In the sample of $M _{0.83} O _{1.00}$, the percentage of metal ions existing in +2 oxidation state is $%$ (nearest integer)
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Answer: (59)
Solution:
$ \begin{aligned} & M \longrightarrow X \\ & 2 x+3(0.83-x)=2 \\ & x=0.49 \\ & % M^{2+}=\frac{0.49}{0.83} \times 100 \\ & =59 % \end{aligned} $
