question_answer 117)

    Mention the type of compounds formed when small atoms like H, C and N get trapped inside the crystal lattice of transition metals. Also give physical and chemical characteristics of these compounds.

Answer:

                    When small atoms like H, C and N get trapped inside the crystal lattice of transition metals. (a) Such compounds are called interstitial compounds. (b) Their characteristic properties are; (i) They have high melting points, higher than those of pure metals. (ii) They are very hard. (iii) They retain metallic conductivity. (iv) They are chemically inert.