In which compound nitrogen has maximum oxidation state____________________?
Correct answer: D. HNO3
- A. N2O
- B. NO2
- C. HNO2
- D. HNO3
Explanation
In HNO3, hydrogen is +1 and oxygen contributes 3 x -2 = -6, so nitrogen must be +5: +1 + N - 6 = 0, giving N = +5. NO2 is the likely wrong choice because nitrogen is +4 there, whereas nitric acid contains nitrogen in its maximum common oxidation state.
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About Oxidation and Reduction
Oxidation involves loss of electrons, increase in oxidation number or addition of oxygen, while reduction involves electron gain, decrease in oxidation number or removal of oxygen. The topic covers oxidising and reducing agents, oxidation-number changes, redox equations and the distinction between oxidation at the anode and reduction at the cathode.
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