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NCERT Solutions for Class 11 Chemistry Chapter 4 : Some p-Block Elements

Q: Q1. How many different types of problems may be found in the NCERT Solutions for Class 11 The p-block elements?

Answer:In Chapter 11 The p-block elements, there are a total of 38 questions in class 11 Chemistry, including both short, and long, chemical equations and MCQ solutions. These are necessary to solve because they contribute to the knowledge of the concepts learned. In order to help students do well on the yearly exam, the solutions to the exercise-specific problems are also available in PDF format.

Q: Q.2. What are the main subtopics in Class 11 Chemistry Chapter 11 related to The p-block elements that might be tested?

Answer:In Chapter 11 The p-block elements, there are a total of 38 questions in class 11 Chemistry, including both short, and long, chemical equations and MCQ solutions. These are necessary to solve because they contribute to the knowledge of the concepts learned. In order to help students do well on the yearly exam, the solutions to the exercise-specific problems are also available in PDF format.

Q: Q3. Is Chapter 11's study of The p-block elements application- or theoretical-based?

Answer:In Chapter 11 The p-block elements, there are a total of 38 questions in class 11 Chemistry, including both short, and long, chemical equations and MCQ solutions. These are necessary to solve because they contribute to the knowledge of the concepts learned. In order to help students do well on the yearly exam, the solutions to the exercise-specific problems are also available in PDF format.

The p-block elements Class 11 Chemistry Chapter 11 deals with the study of essential topics related to the study of the p-block elements. Class 11 Chemistry Chapter 11 explains the key concepts related to the electronic configuration, preparation of The p-block elements, physical properties of The p-block elements and many more. The concepts taught in Class 11 Chapter 11 will also help students to gain a thorough understanding of this concept and its practical applications.

Chemistry Class 11 Chapter 11 also covers topics on Different forms of The p-block elements, atomic radii and various chemical properties. Students will quickly learn about these concepts if they practice Chapter 11 Chemistry Class 11 NCERT Solutions. All of these solutions have been created with the new CBSE pattern in mind, ensuring that students have a thorough understanding of their exams. The objective of CBSE class 11 Chemistry Chapter 11 The p-block elements is to present thorough information about the subject in a way that is extremely simple and clear.

Chapter 11 Chemistry Class 11 Questions and Answers can help you get good grades in tests and properly prepare for all of the important concepts. Several examples provided in the solutions will assist students with a better understanding of The p-block elements. Class 11 NCERT Solutions Chapter 11 are available below in pdf format, and a few solutions are also included in the exercises. These solutions explain the topics covered with examples so that students can easily relate to the notion being discussed.

Table of Content

Introduction

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Access NCERT Solutions for Class 11 Chemistry Chapter 4 : Some p-Block Elements

Exercise Page Number 332

Question 1

Discuss the pattern of variation in the oxidation states of (i)

B

T i

and (ii)

C

P b

Medium

Solution

Verified by Toppr

(i) B shows

+ 3

oxidation state. Other group 13 elements s show

+ 1

and

+ 3

oxidation state.
On moving down the group 13, the stability of

+ 1

oxidation state increases and the stability of

+ 3

oxidation state decreases due to inert pair effect.
B and Al show

+ 3

oxidation state,

G a

and

I n

show

+ 1

and

+ 3

oxidation states and

T l

mainly shows

+ 1

oxidation state.

(ii) Group 14 elements show

+ 2

and

+ 4

oxidation states. The stability of

+ 2

oxidation state increases and the stability of

+ 4

oxidation state decreases due to inert pair effect.

C

and

S i

mainly show

+ 4

oxidation state,

G e

and

S n

show

+ 2

and

+ 4

oxidation state and

P b

mainly shows

+ 2

oxidation state.

Question 2

How can you explain higher stability of

B C l_{3}

as compared to

T l C l_{3}

Medium

Solution

Verified by Toppr

B shows +3 oxidation state and can form stable

B C l_{3}

. Thallium shows +1 and +3 oxidation state. Due to inert pair effect, +1 oxidation state is more stable than +3 oxidation state. Hence,

B C l_{3}

is stable but

T l C l_{3}

not.

Question 3

Explain why

B F_{3}

behaves as a lewis acid.

Medium

Solution

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Boron trifluoride B F_{3} behaves as Lewis acid because it is an electron-deficient species and it can accept

electron pair.

Here we see Boron configuration is

1 s^{2} 2 s^{2} 2 p^{1}

and

vacant p-orbital

exist, which indicates that mean

B F_{3}

has the tendency to accept lone pair, hence

B F_{3}

l e w i s a c i d .

Question 4

Consider the compounds

B C l_{3}

and

C C l_{4}

. How will they behave with water? Justify.

Hard

Solution

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B C l_{3}

, B atom is electron deficient and accepts an electron pair from water. It is hydrolyzed to boric acid.

B C l_{3} + 3 H_{2} O \to H_{3} B O_{3} + 3 H C l

On the other hand,

C C l_{4}

is an electron precise molecule. C has completed its octet and cannot expand its valency shell due to absence of d orbitals. Hence, it can neither donate nor accept electrons. Hence,

C C l_{4}

is not hydrolyzed.

Question 5

Is boric acid a protic acid? Explain.

Medium

Solution

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Boric acid does not ionize in water to give proton. Hence, it is not a protic acid. It is a Lewis acid as it accepts electrons from hydroxide ions.

B (O H)_{3} (a q) + 2 H_{2} O \to [B (O H_{4})]^{-} (a q) + H_{3} O^{+} (a q)

therefore, boric acid is not protic acid.

Question 6

Explain what happens when boric acid is heated.

Medium

Solution

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When boric acid is heated, boron trioxide is obtained.

H_{3} B O_{3} H e a t 373 K Metaboric acid H B O_{2} + H_{2} O

4 H B O_{2} H e a t - H_{2} O H_{2} B_{4} O_{7} H e a t Boron trioxide 2 B_{2} O_{3} + H_{2} O

Question 7

Describe the shapes of

B F_{3}

and

B H_{4}^{-}

. Assign the hybridisation of boron in these species.

Hard

Solution

Verified by Toppr

The central

B

atom in

B F_{3}

undergoes

s p^{2}

hybridization which results in trigonal planar geometry with three bond pairs and 0 lone pairs of electrons.
The central

B

atom in

B H_{4}^{-}

undergoes

s p^{3}

hybridization which results in tetrahedral geometry with 4 bond pairs and 0 lone pairs of electrons.

Question 8

Write reactions to justify amphoteric nature of aluminium.

Medium

Solution

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Aluminium is amphoteric in nature as it reacts with acids as well as alkalies.

2 A l + 6 H C l \to 2 A l^{3 +} + 6 C l^{-} + 3 H_{2}

2 A l + 2 N a O H + 6 H_{2} O \to 2 N a [A l (O H)_{4}]^{-} + 3 H_{2}

Question 9

What are electron deficient compounds ? Are

B C l_{3}

and

S i C l_{4}

electron deficient species? Explain.

Hard

Solution

Verified by Toppr

In electron deficient compounds, the central atom either does not have eight electrons in the valence shell or it has eight electrons but can expand its valence beyond 4 due to presence of vacant d orbitals.

B C l_{3}

has 6 valence electrons on B atom and accepts pair of electrons from ammonia to complete its octet. Hence, it is an electron deficient compound.
In

S i C l_{4}

, the central Si atom has 8 electrons but it can expand its valency beyond 4 due to presence of vacant d orbitals. Hence, it is also an electron deficient compound.

Question 10

Write the resonance structures of

C O_{3}^{- 2}

and

H C O_{3}^{-}

Hard

Solution

Verified by Toppr

The resonance structures of carbonate ion and bicarbonate ion along with resonance hybrid are shown below.

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NCERT Solutions for Class 11 Chemistry Chapter 4 : Some p-Block Elements

NCERT Solutions for Class 11 Chemistry Chapter 11 The p-block elements – Brief Overview

Physical Features (i) Borosine has a high melting point because of its robust crystalline structure. The rest of this family's members have low melting points. (ii) Boron is a naturally occurring, highly hard, solid, and non-metallic substance. (iii) Other members of this family include soft metals with good electrical conductivity and low melting points. Chemical Features Oxidation states: The first two elements in this group, boron and aluminium, only display a +3 oxidation state in their compounds, however gallium, indium, and thalium additionally exhibit a +1 oxidation state in addition to a +3 oxidation state, demonstrating varied oxidation states. The stability of the +3 oxidation state gradually reduces as we travel down the group, whereas the stability of the +1 oxidation state gradually rises. Nuclear power Due to the ability of d- and f-electrons, which have a low screening effect to offset the rise in nuclear charge, there is predicted discontinuity in the ionization enthalpy values between Al and Ga and between In and Tl. Electronegativity: As you go down the group, it initially drops from B to Al before rising. Atomic Radii Group 13 elements have lower atomic and ionic radii than their equivalents in alkali and alkaline earth metals. The outside electrons are more strongly drawn towards the nucleus while travelling from left to right during a period due to an increase in effective nuclear charge. The atomic size decreases as a consequence.

Related Chapters

Chapter 1 : Redox Reactions

Chapter 2 : Hydrogen

Chapter 3 : The s-Block Elements

Chapter 5 : Organic Chemistry - Some Basic Principles and Techniques

Chapter 6 : Hydrocarbons

Chapter 7 : Environmental Chemistry

Frequently Asked Questions on NCERT Class 11 Chemistry Chapter 4 : Some p-Block Elements

Q1. How many different types of problems may be found in the NCERT Solutions for Class 11 The p-block elements?

Answer:In Chapter 11 The p-block elements, there are a total of 38 questions in class 11 Chemistry, including both short, and long, chemical equations and MCQ solutions. These are necessary to solve because they contribute to the knowledge of the concepts learned. In order to help students do well on the yearly exam, the solutions to the exercise-specific problems are also available in PDF format.

Q.2. What are the main subtopics in Class 11 Chemistry Chapter 11 related to The p-block elements that might be tested?

Q3. Is Chapter 11's study of The p-block elements application- or theoretical-based?

Related Chapters

Chapter 1 : Redox Reactions

Chapter 2 : Hydrogen

Chapter 3 : The s-Block Elements

Chapter 5 : Organic Chemistry - Some Basic Principles and Techniques

Chapter 6 : Hydrocarbons

Chapter 7 : Environmental Chemistry