The S-Block Elements

Question

What happens when:
(i) Lithium reacts with air
(ii) Lithium reacts with water
(iii) Lithium reacts with halogen
(iv) Lithium reacts with acids?

Solution

(i) When heated in air, lithium combines with both oxygen and nitrogen.

4 Li space plus space straight O subscript 2 space space rightwards arrow with Heat on top space space stack 2 Li subscript 2 straight O with Lithium space oxide below 6 Li space plus space straight N subscript 2 space rightwards arrow with Heat on top space space space stack 2 Li subscript 3 straight N with Lithium space space nitride below

(ii) Lithium reacts with water slowly to evolve hydrogen.

2 Li space plus space 2 straight H subscript 2 straight O space rightwards arrow space space 2 LiH space plus space straight H subscript 2

(iii) Lithium form halides on reacting with halogen.

2 Li space plus space Cl subscript 2 space space rightwards arrow space space 2 LiCl

.
The halides of lithium are mostly covalent in nature.
(iv) Lithium reacts with dilute HCl and dilute H₂SO₄ to evolve hydrogen gas.

2 Li space plus space 2 HCl space space rightwards arrow space space space 2 LiCl space plus space straight H subscript 2

The reaction with concentrated H₂SO₄ is highly exothermic and the metal catches fire.

Some More Questions From The s-Block Elements Chapter

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The S-Block Elements

What happens when:
(i) Lithium reacts with air
(ii) Lithium reacts with water
(iii) Lithium reacts with halogen
(iv) Lithium reacts with acids?

Some More Questions From The s-Block Elements Chapter

Why are alkali metals not found in nature?

Lithium shows similarities to magnesium in the chemical behaviour. What is the cause of this similarity?

What is the nature of lithium compounds?

Group 1 elements are called alkali metals. Why?

Why caesium can be used in photoelectric cell while lithium can not be?

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?

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The S-Block Elements

What happens when:(i) Lithium reacts with air(ii) Lithium reacts with water(iii) Lithium reacts with halogen(iv) Lithium reacts with acids?

Some More Questions From The s-Block Elements Chapter

Why are alkali metals not found in nature?

Lithium shows similarities to magnesium in the chemical behaviour. What is the cause of this similarity?

What is the nature of lithium compounds?

Group 1 elements are called alkali metals. Why?

Why caesium can be used in photoelectric cell while lithium can not be?

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?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

What happens when:
(i) Lithium reacts with air
(ii) Lithium reacts with water
(iii) Lithium reacts with halogen
(iv) Lithium reacts with acids?

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

Why alkali metals do not form M²⁺ions?