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Which of the following metal evolves hydrogen on reacting with cold dilute HNO3?

1. Mg
2. Al
3. Fe
4. Cu

Correct answer: Mg

Solution

Magnesium (Mg) reacts with cold dilute HNO3 to produce hydrogen gas because it is highly reactive and can displace hydrogen from the acid. Other metals like Al and Fe form protective oxide layers, and Cu does not react with dilute HNO3.

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