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The first element of group different for...

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-availability of low lying d-orbitals.
The first element of a group shows resemblance 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 be

A

Li

B

Na

C

K

D

Mg

Text Solution

Verified by Experts

The correct Answer is:
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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