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Solubility in Ammonia (Group 1)

MetalM + N 2 ...

Question

$M e t a l M + N_{2} h e a t - -- \to N i t r i d e H_{2} O - -- \to N H_{3}$ , Metal M is

A

Na

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B

K

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C

Li

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D

Rb

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Solution

The correct option is C
Li

Lattice energy of the compound formed between small cation and small anion is highest. Since, nitride ion is a small anion and the lattice energy of the compound formed with small lithium cation is high. Lithium nitride is the most stable nitride of all the alkali metal nitrides. Hydrolysis of lithium hydride liberates ammonia gas.

$6 L i + N_{2} \to 2 L i_{3} N H_{2} O - -- \to L i O H + N H_{3} (g)$

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Similar questions

Q. Which one of the alkali metals forms only the normal oxide

M_{2} O

on heating in air?

Q. Metal (s) M in the following equation is/are

M + N \to M e t a l n i t r i d e

Q. Considering the elements

K, C a, R b

C s

, the correct order of their metallic character is:

Q. Comment on each of the following observations:
(a) The mobilities of the alkali metal ions in aqueous solution are

L i^{+} < N a^{+} < K^{+} < R b^{+} < C s^{+}

.
(b) Lithium is the only alkali metal to form a nitride directly.
(c)

E^{⊖}

M^{2 +} (a q) + 2 e^{-} \to M (s)

M = C a, S r

B a

) is nearly constant.

Comment on each of the following observations:

(a) The mobilities of the alkali metal ions in aqueous solution are Li⁺ < Na⁺ < K⁺< Rb⁺ < Cs⁺

(b) Lithium is the only alkali metal to form a nitride directly.

(c) (where M = Ca, Sr or Ba) is nearly constant.

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