One mole of \( H N O_{3} \) absorbs 5 moles of electrons in a redox reaction. The reduced product of this reaction is :

1 mole \( N_{2} \)
1 mole \( N_{2} \) O
1 mole \( N O_{2} \)
1 mole \( N H_{3} \)

Correct answer: 1 mole \( N H_{3} \)

Solution

In HNO3, nitrogen is at oxidation state +5. Gaining 5 electrons reduces nitrogen to -3, which corresponds to NH3. So the reduced product formed from one mole of HNO3 is one mole of NH3.

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