(D) Interstitial compounds are formed when small atoms like $H$,$C$,or $N$ are trapped inside the crystal lattice of transition metals.$(I)$ They are

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They are chemically very active

(D) Interstitial compounds are formed when small atoms like $H$,$C$,or $N$ are trapped inside the crystal lattice of transition metals.$(I)$ They are very hard and rigid.$(II)$ They have high melting points,which are higher than those of the pure metals.$(III)$ They retain metallic conductivity.$(IV)$ They are chemically inert.