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The first element of a group differes fr...

The first element of a group differes from its congeners, i.e other members of the group in many ways. These difference may be due to the following i) Small size of atom and ion ii) High electronegetivity 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" underset("hydroysis")overset(H_(2)O)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
`6Li+N_(2)rarr2Li_(2)N`
`6Mg+N_(2)rarr2Mg_(3)N`
`Mg_(3)+3H_(2)Orarr3Mg(OH)_(2)+NH_(3)` Due to small size of cation, `M^(+)` and `N^(3-)`, lattice energy of nitride formed is high and hence `Li^(+)` and `Mg^(2+)` form stable nitride
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