What happens when concentrated $H N O_{3}$ is added to iron metal?

Nitrogen is given out

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Hydrogen is given out

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The metal becomes passive

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F e (N O_{3})_{2}

is formed

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Solution

The correct option is C The metal becomes passive
Treating metals (iron, chromium, aluminum, and calcium) with concentrated nitric acid can produce a protective oxide layer over the metal that halts further reactions. So, iron becomes passive when treated with conc. nitric acid.

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Metals like iron, aluminium, cobalt and nickel become passive when treated with pure concentrated nitric acid.

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H_{2} S O_{4}

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