Question

Comment on each of the following observations:
Lithium is the only alkali metal which forms nitride directly.

Solution

Due to the diagonal relationship of Li and Mg (both have similar ionic sizes), lithium like magnesium forms a nitride on heating with nitrogen while other alkali metals do not.

Lithium is the only alkali metal which forms a nitride directly Li⁺ and N₃^- ions are very small, so they form stable Li₃N.

6 Li left parenthesis straight s right parenthesis space plus space straight N subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow with Heat space on top space 2 Li subscript 3 straight N left parenthesis straight s right parenthesis

Some More Questions From The s-Block Elements Chapter

In aqueous solution, Li⁺ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

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The S-Block Elements

Comment on each of the following observations:
Lithium is the only alkali metal which forms nitride directly.

Some More Questions From The s-Block Elements Chapter

In aqueous solution, Li⁺ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason.

Which is the most reactive alkali metal and why?

Why alkali metals do not form M²⁺ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

Why are alkali metal ions diamagnetic and colourless?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

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For Daily Free Study Material Join wiredfaculty

The S-Block Elements

Comment on each of the following observations:Lithium is the only alkali metal which forms nitride directly.

Some More Questions From The s-Block Elements Chapter

In aqueous solution, Li+ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason.

Which is the most reactive alkali metal and why?

Why alkali metals do not form M2+ ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

Why are alkali metal ions diamagnetic and colourless?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Comment on each of the following observations:
Lithium is the only alkali metal which forms nitride directly.

In aqueous solution, Li⁺ ion has lowest mobility. Why?

Why alkali metals do not form M²⁺ions?