Q30 / 90 · JEE Main 2023 (31 Jan Shift 2) · Chemistry

A sample of a metal oxide has formula M0.83O1.00. The metal M can exist in two oxidation states +2 and +3. In the sample of M0.83O1.00, the percentage of metal ions existing in +2 oxidation state is %. (nearest integer)

Correct answer: 59

Solution

Let number of ions of M+2=x

Thus, as net charge has to be zero, M+3=0.83-x

⇒2x+3(0.83-x)+1(-2)=0

⇒2x+2.49-3x-2=0

∴x=0.49

%M2+ ions =0.490.83×100=59.03

Hence, the correct answer is 59.

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