Answer:
(d) Interstitial
compounds are formed when small atoms are trapped inside the crystal lattice of
metals. Some of their important characteristics are as follows
(i) They are very hard and rigid.
(ii) They have high
melting point which are higher than those of the pure metals.
(iii) They
show conductivity like that of the pure metal.
(iv) They acquire
chemical inertness.
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