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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-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 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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Knowledge Check

  • 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. On heating which of the following gives NO_(2) ?

    A
    `NaNO_(3)`
    B
    `LiNO_(3)`
    C
    `NH_(4)NO_(3)`
    D
    `NH_(4)NO_(2)`

  • 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. Which of the following is a false statement ?

    A
    Lithium has greateer hardnes as compound to other alkali metals.
    B
    `LiHCO_(3)` and `Mg(HCO_(3))_(2)`, do not exist in the solid state.
    C
    Lithium and magnesium form nitrides on reacting with nitrogen but other alkali metals do not.
    D
    Alkali metal flurides are highly soluble in water.

  • 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. In dry air, lithium and sodium react to give

    A
    `Li_(2)O, Li_(3)N, Na_(2)O`
    B
    `Li_(2), Na_(2)O`
    C
    `Li_(2)O, Li_(3)N, NH_(3), Na_(2)O`
    D
    `Li_(2)O, Li_(3)N, Na_(2)O, Na_(3)N`

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    The first element of a group in many ways differ from the heavier memebers of group. This is due to

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