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What is the oxidation number of nitrogen...

What is the oxidation number of nitrogen in (a) nitric acid (b) nitrous acid (c) nitric oxide (d) nitrous oxide (e) ammonia (f) `N_2` ?

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The correct Answer is:
(a) +5, (b) +3, (c) +2, (d) +1, (e) -3 ; nitrogen is more electronegative than H, (f) 0.
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