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The statement that is INCORRECT about the interstitial compounds is:
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They are chemically reactive.
The principal physical and chemical characteristics of interstitial compounds are as follows:
(i) They have high melting points, higher than those of pure metals.
(ii) They are very hard, some borides approach diamond in hardness.
(iii) They retain metallic conductivity.
(iv) They are chemically inert.
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