What is change in oxidation number of nitrogen when NO_3^- is converted into NH_4^+ ion?

MHT CET 2024 Chemistry question

What is change in oxidation number of nitrogen when is converted into ion?

Answer: (A)

In : , so . In : , so . So the oxidation number of nitrogen changes from to , a decrease of 8 (reduction),

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Question ID VK-095492