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प्रश्न
Which gas is evolved when magnesium metal reacts with very dilute HNO3?
पर्याय
Oxygen
Nitrogen
Hydrogen
Nitrogen Dioxide
MCQ
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उत्तर
Hydrogen
Explanation:
Very dilute HNO3 acts as a regular (non‑oxidising) acid and reacts with magnesium to form magnesium nitrate and H2 gas: \[\ce{Mg + 2HNO3 -> Mg(NO3)2 + H2}\]. Concentrated HNO3, being oxidizing, yields nitrogen oxides instead.
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