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Q.

When zinc reacts with very dilute HNO3, the oxidation state of nitrogen changes from:

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a

+5 to +4

b

+5 to +3

c

+5 to +1

d

+5 to -3

answer is B.

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Detailed Solution

Reaction of Zinc with Very Dilute Nitric Acid (HNO3)

When zinc reacts with very dilute nitric acid, nitric acid mainly behaves as an acid (not a strong oxidizer). Zinc displaces hydrogen and the nitrate ion remains unchanged.

Balanced equation:

Zn + 2 HNO3 → Zn(NO3)2 + H2↑

Oxidation state of nitrogen:

In HNO3 nitrogen has oxidation state +5, and it remains +5 in the nitrate ion (NO3−) in Zn(NO3)2. So, the oxidation state of nitrogen does not change in this reaction.

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