# NCERT solutions for Chemistry Part 1 and 2 Class 11 chapter 11 - The p-Block Elements [Latest edition]

## Chapter 11: The p-Block Elements

EXERCISES
EXERCISES [Pages 331 - 333]

### NCERT solutions for Chemistry Part 1 and 2 Class 11 Chapter 11 The p-Block Elements EXERCISES [Pages 331 - 333]

EXERCISES | Q 11.1 - (i) | Page 331

Discuss the pattern of variation in the oxidation states of  B to Tl.

EXERCISES | Q 11.1 - (ii) | Page 331

Discuss the pattern of variation in the oxidation states of C to Pb.

EXERCISES | Q 11.2 | Page 331

How can you explain higher stability of BClas compared to TlCl3?

EXERCISES | Q 11.3 | Page 331

Why does boron trifluoride behave as a Lewis acid?

EXERCISES | Q 11.4 | Page 331

Consider the compound, BCl3. How will BCl3 behave with water? Justify.

EXERCISES | Q 11.4 | Page 331

Consider the compound, CCl4. How will CCl4 behave with water? Justify.

EXERCISES | Q 11.5 | Page 331

Is boric acid a protic acid? Explain.

EXERCISES | Q 11.6 | Page 331

Explain what happens when boric acid is heated.

EXERCISES | Q 11.7 | Page 331

Describe the shapes of BF3 and BH4. Assign the hybridisation of boron in these species.

EXERCISES | Q 11.8 | Page 331

Write reactions to justify amphoteric nature of aluminium.

EXERCISES | Q 11.9 | Page 331

What are electron deficient compounds? Are BCl3 and SiCl4 electron deficient species? Explain

EXERCISES | Q 11.10 - (a) | Page 332

Write the resonance structure of "CO"_3^(2-).

EXERCISES | Q 11.10 - (b) | Page 332

Write the resonance structure of "HCO"_3^(-).

EXERCISES | Q 11.11 - (a) | Page 332

What is the state of hybridisation of carbon in "CO"_3^(2-).

EXERCISES | Q 11.11 - (b) | Page 332

What is the state of hybridisation of carbon in Diamond ?

EXERCISES | Q 11.11 - (c) | Page 332

What is the state of hybridisation of carbon in graphite?

EXERCISES | Q 11.12 | Page 332

Explain the difference in properties of diamond and graphite on the basis of their structures.

EXERCISES | Q 11.13 (a) | Page 332

Rationalise the given statement and give a chemical reaction:

Lead (II) chloride reacts with Cl2 to give PbCl4.

EXERCISES | Q 11.13 (b) | Page 332

Rationalise the given statement and give a chemical reaction:

Lead (IV) chloride is highly unstable towards heat.

EXERCISES | Q 11.13 (c) | Page 332

Rationalise the given statement and give a chemical reaction:

Lead is known not to form an iodide, PbI4.

EXERCISES | Q 11.14 | Page 332

Suggest reasons why the B–F bond lengths in BF3 (130 pm) and "BF"_4^(-) (143 pm) differ.

EXERCISES | Q 11.15 | Page 332

If B–Cl bond has a dipole moment, explain why BCl3 molecule has zero dipole moment.

EXERCISES | Q 11.16 | Page 332

Aluminium trifluoride is insoluble in anhydrous HF but dissolves on the addition of NaF. Aluminium trifluoride precipitates out of the resulting solution when gaseous BF3 is bubbled through. Give reasons.

EXERCISES | Q 11.17 | Page 332

Suggest a reason as to why CO is poisonous.

EXERCISES | Q 11.18 | Page 332

How is an excessive content of COresponsible for global warming?

EXERCISES | Q 11.19 | Page 332

Explain the Structure of Diborane.

EXERCISES | Q 11.19 | Page 332

Explain the Structure of Boric Acid.

EXERCISES | Q 11.20 - (a) | Page 332

What happens when Borax is heated strongly.

EXERCISES | Q 11.20 - (b) | Page 332

What happens when Boric acid is added to water?

EXERCISES | Q 11.20 - (c) | Page 332

What happens when Aluminium is treated with dilute NaOH?

EXERCISES | Q 11.20 - (d) | Page 332

What happens when BF3 is reacted with ammonia?

EXERCISES | Q 11.21 - (a) | Page 332

Explain the following reaction.

Silicon is heated with methyl chloride at high temperature in the presence of copper.

EXERCISES | Q 11.21 - (b) | Page 332

Explain the following reaction.

Silicon dioxide is treated with hydrogen fluoride.

EXERCISES | Q 11.21 - (c) | Page 332

Explain the following reaction.

CO is heated with ZnO.

EXERCISES | Q 11.21 - (d) | Page 332

Explain the following reaction.

Hydrated alumina is treated with aqueous NaOH solution.

EXERCISES | Q 11.22 - (i) | Page 332

Give reason for Conc. HNO3 can be transported in aluminium container.

EXERCISES | Q 11.22 - (ii) | Page 332

Give reasons: A mixture of dilute NaOH and aluminium pieces is used to open drain.

EXERCISES | Q 11.22 - (iii) | Page 332

Give reasons: Graphite is used as a lubricant.

EXERCISES | Q 11.22 - (iv) | Page 332

Give reasons: Diamond is used as an abrasive.

EXERCISES | Q 11.22 - (v) | Page 332

Give reasons: Aluminium alloys are used to make aircraft body.

EXERCISES | Q 11.22 - (vi) | Page 332

Give reasons: Aluminium utensils should not be kept in water overnight.

EXERCISES | Q 11.22 - (vii) | Page 321

Give reasons: Aluminium wire is used to make transmission cables.

EXERCISES | Q 11.23 | Page 332

Explain why is there a phenomenal decrease in ionisation enthalpy from carbon to silicon?

EXERCISES | Q 11.24 | Page 332

How would you explain the lower atomic radius of Ga as compared to Al?

EXERCISES | Q 11.25 - (a) | Page 332

What are allotropes?

EXERCISES | Q 11.25 - (b) | Page 332

Sketch the structure of two allotropes of carbon namely diamond and graphite. What is the impact of structure on physical properties of two allotropes?

EXERCISES | Q 11.26 (a) | Page 333

Classify the following oxide as neutral, acidic, basic or amphoteric:

CO

• neutral

• acidic

• basic

• amphoteric

EXERCISES | Q 11.26 (a) | Page 333

Classify the following oxide as neutral, acidic, basic or amphoteric:

B2O3

• neutral

• acidic

• basic

• amphoteric

EXERCISES | Q 11.26 (a) | Page 333

Classify the following oxide as neutral, acidic, basic or amphoteric:

SiO2

• neutral

• acidic

• basic

• amphoteric

EXERCISES | Q 11.26 (a) | Page 333

Classify the following oxide as neutral, acidic, basic or amphoteric:

CO2

• neutral

• acidic

• basic

• amphoteric

EXERCISES | Q 11.26 (a) | Page 333

Classify the following oxide as neutral, acidic, basic or amphoteric:

Al2O3

• neutral

• acidic

• basic

• amphoteric

EXERCISES | Q 11.26 (a) | Page 333

Classify the following oxide as neutral, acidic, basic or amphoteric:

PbO2

• neutral

• acidic

• basic

• amphoteric

EXERCISES | Q 11.26 (a) | Page 333

Classify the following oxide as neutral, acidic, basic or amphoteric:

Tl2O3

• neutral

• acidic

• basic

• amphoteric

EXERCISES | Q 11.26 (b) | Page 333
Write suitable chemical equations to show the nature of the following oxide.
CO
EXERCISES | Q 11.26 (b) | Page 333

Write suitable chemical equations to show the nature of the following oxide.

B2O3

EXERCISES | Q 11.26 (c) | Page 333

Write suitable chemical equations to show the nature of the following oxide.

SiO2

EXERCISES | Q 11.26 (b) | Page 333

Write suitable chemical equations to show the nature of the following oxide.

CO2

EXERCISES | Q 11.26 (b) | Page 333

Write suitable chemical equations to show the nature of the following oxide.

Al2O3

EXERCISES | Q 11.26 (b) | Page 333

Write suitable chemical equations to show the nature of the following oxide.

PbO2

EXERCISES | Q 11.26 (b) | Page 333

Write suitable chemical equations to show the nature of the following oxide.

Tl2O3

EXERCISES | Q 11.27 | Page 333

In some of the reactions thallium resembles aluminium, whereas in others it resembles with group I metals. Support this statement by giving some evidences.

EXERCISES | Q 11.28 | Page 333

When metal X is treated with sodium hydroxide, a white precipitate (A) is obtained, which is soluble in excess of NaOH to give soluble complex (B). Compound (A) is soluble in dilute HCl to form compound (C). The compound (A) when heated strongly gives (D), which is used to extract the metal. Identify (X), (A), (B), (C) and (D). Write suitable equations to support their identities.

EXERCISES | Q 11.29 - (a) | Page 333

What do you understand by inert pair effect?

EXERCISES | Q 11.29 - (b) | Page 333

What are allotropes?

EXERCISES | Q 11.29 - (c) | Page 333

What do you understand by catenation?

EXERCISES | Q 11.30 | Page 333

A certain salt X, gives the following results.

1. Its aqueous solution is alkaline to litmus.
2. It swells up to a glassy material Y on strong heating.
3. When conc. H2SO4 is added to a hot solution of X, white crystal of an acid Z separates out.

Write equations for all the above reactions and identify X, Y and Z.

EXERCISES | Q 11.31 - (i) | Page 333

Write a balanced equation for  BF3 + LiH → ?

EXERCISES | Q 11.31 - (ii) | Page 333

Write a balanced equation for B2H6 + H2O → ?

EXERCISES | Q 11.31 - (iii) | Page 333

Write a balanced equation for NaH + B2H6 → ?

EXERCISES | Q 11.31 - (iv) | Page 333

Write a balanced equation for $\ce{H3BO3 ->[\Delta]}$?

EXERCISES | Q 11.31 - (v) | Page 333

Write a balanced equation for Al + NaOH → ?

EXERCISES | Q 11.31 - (vi) | Page 333

Write a balanced equation for B2H6 + NH3 → ?

EXERCISES | Q 11.32 | Page 333

Give one method for industrial preparation and one for laboratory preparation of CO.

EXERCISES | Q 11.32 | Page 333

Give one method for industrial preparation and one for laboratory preparation of CO2.

EXERCISES | Q 11.33 | Page 333

An aqueous solution of borax is _______.

• neutral

• amphoteric

• basic

• acidic

EXERCISES | Q 11.34 | Page 333

Boric acid is polymeric due to ______.

• its acidic nature

• the presence of hydrogen bonds

• its monobasic nature

• its geometry

EXERCISES | Q 11.35 | Page 333

The type of hybridisation of boron in diborane is ______.

• sp

• sp2

• sp3

• dsp2

EXERCISES | Q 11.36 | Page 333

Thermodynamically the most stable form of carbon is ______.

• diamond

• graphite

• fullerenes

• coal

EXERCISES | Q 11.37 | Page 333

Elements of group 14 ________.

• exhibit oxidation state of +4 only

• exhibit oxidation state of +2 and +4

• form M2– and M4+ ions

• form M2+ and M4+ ions

EXERCISES | Q 11.38 | Page 333

If the starting material for the manufacture of silicones is RSiCl3, write the structure of the product formed.

EXERCISES

## NCERT solutions for Chemistry Part 1 and 2 Class 11 chapter 11 - The p-Block Elements

NCERT solutions for Chemistry Part 1 and 2 Class 11 chapter 11 (The p-Block Elements) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CBSE Chemistry Part 1 and 2 Class 11 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Chemistry Part 1 and 2 Class 11 chapter 11 The p-Block Elements are Introduction to p-block Elements, Group 13 Elements - The Boron Family, Important Trends and Anomalous Properties of Boron, Some Important Compounds of Boron, Uses of Boron and Aluminium and Their Compounds, Group 14 Elements - the Carbon Family, Important Trends and Anomalous Behaviour of Carbon, Allotropes of Carbon - Diamond, Allotropes of Carbon - Graphite, Allotropes of Carbon - Fullerenes, Allotropes of Carbon - Uses of Carbon, Some Important Compounds of Carbon and Silicon - Carbon Monoxide, Some Important Compounds of Carbon and Silicon - Carbon Dioxide, Some Important Compounds of Carbon and Silicon - Silicon Dioxide, Some Important Compounds of Carbon and Silicon - Silicones, Some Important Compounds of Carbon and Silicon - Silicates, Some Important Compounds of Carbon and Silicon - Zeolites.

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