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The first element of group different form its congeners, i.e. other members of the group in many ways. These differences may be due to the following: i. Small size of atom and ion. ii. High electronegativity. iii. Non-availibility of low lying d-orbitals. The first element of a group shows resemblence with the second element of the adjacent group on the right. This is known as diagonal relationship. Metal `(M)+N_(2)rarr` Nitride `overset(H_(2)O)underset("Hydrolysis")rarr NH_(3)` Metal (M) can beA. LiB. NaC. KD. Mg |
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Answer» Correct Answer - A::D `6Li+N2 rarr 2Li_(3)N` `3H_(2)O+Li_(3)N rarr 3LiOH+NH_(3)` `6Mg+N_(2)rarr 2Mg_(3)N` `Mg_(3)N+3H_(2)O rarr 3Mg(OH)_(2)+NH_(3)` Due to the small size of cation, `M(o+)` and anion `N6(3-)`, lattice energy of nitride formed is high and hence `Li^(o+)` and `Mg^(2+)` form stable nitride. |
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