7. What are the oxidation number of 'O' in OF2 and Cr in Na2Cr2O7?
OR
Define disproportionation reaction with an example.

9. Oxygen and nitrogen are present in a mixture in ratio 1 : 4 by weight. Calculate the ratio between their molecules.

Dear Student

Question No. 7
I Part-

Kindly refer to the given link -
https://www.meritnation.com/ask-answer/question/solve-48-48-the-oxidation-number-of-o-in-the-following/electrochemistry/11363943

Oxidation No. of Cr in Na2Cr2O7 -
Oxidation No, of Na = 1+      ;   Cr =  ??    ;   O = 2- 
So, 
(2 * 1) + (2 * x) + (7 * (-2)) = 2 + 2x - 14 
Therefore, 
2x = 14 - 2
2x = 12
So, x = +6

Question No. 9 -
https://www.meritnation.com/ask-answer/question/oxygen-and-nitrogen-are-present-in-a-mixture-in-the-ratio-1/chemistry/9558613

Regards

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