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Which of the following statements about the interstitial compounds is incorrect?

1. They are chemically reactive.
2. They are much harder then the pure metal.
3. They have higher melting points than the pure metal.
4. They retain metallic conductivity.

Correct answer: They are chemically reactive.

Solution

Interstitial compounds are generally chemically inert due to the strong metallic bonding and the small non-metal atoms fitting into the metal lattice without disrupting it. Thus, option A is incorrect.

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