Which of the following is incorrect?

Ionic compounds are generally brittle and break into pieces when pressure is applied.

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Hydrogen gas is evolved when copper reacts with nitric acid.

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Metal + Dilute acid → Salt + Hydrogen.

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Ionic compounds have high melting and boiling points.

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Solution

The correct option is B
Hydrogen gas is evolved when copper reacts with nitric acid.

Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because HNO₃ is a strong oxidising agent.

It oxidises the H₂ produced to water and itself gets reduced to any of the nitrogen oxides (N₂O, NO, NO₂).

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