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Question

A mole of N2H4 loses 10 mol of electrons to form a new compound Y. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in Y? (There is no change in the oxidation number of hydrogen)

A
1
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B
3
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C
+3
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D
+5
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Solution

The correct option is C +3
As given,
N2H42y+10e
Let x be the oxidation state of N in N2H4.
Since, the overall charge on the complex is 0, the sum of oxidation states of all elements in it should be equal to 0.

2x+4=0
2y=2x, by replacing y, we get
2x+4=10
or, x=3

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