Incorrect statement of interstitial compounds formed by d-block elements is

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They are hard & some borides have hardness similar to diamond

Their melting points are lower than those of pure metals

They are chemically inert

They show metallic conductivity

answer is D.

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Detailed Solution

Interstitial hydrides are formed when Hydrogen atoms combined with metals. The void present betweeen the metal atoms is filled by hydride ion. Due to which the interstial compound is now inert in nature.The melting points of interstitial compounds are generally higher than those of pure metals because of bonding between the metal and the non-metal hydrogen, is stronger than metal–metal bonding.

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