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Question

One mole of N2H4 loses 10 moles of electrons to form a new compound A. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in A?

[There is no change in the oxidation state 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
The oxidation state of N in hydrazine is -2.
1 mole of hydrazine contains 2 moles of N and loses 10 moles of electrons. Hence, 1 N atom will lose 5 electrons. Hence, its oxidation number will increase by 5.
Hence, the oxidation number of N in compound A will be 2+5=+3.

Hence, the correct option is C

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