Chapter 11 - The p-Block Elements
Pages 323 - 325
Discuss the pattern of variation in the oxidation states of B to Tl
Discuss the pattern of variation in the oxidation states of C to Pb.
How can you explain higher stability of BCl3 as compared to TlCl3?
Why does boron trifluoride behave as a Lewis acid?
Consider the compounds, BCl3 and CCl4. How will they behave with water? Justify.
Is boric acid a protic acid? Explain.
Explain what happens when boric acid is heated.
Describe the shapes of BF3 and BH4–. Assign the hybridisation of boron in these species.
Write reactions to justify amphoteric nature of aluminium.
What are electron deficient compounds? Are BCl3 and SiCl4 electron deficient species? Explain
Write the resonance structure of `CO_3^(2-)`
Write the resonance structures of `HCO_3^(-)`
What is the state of hybridisation of carbon in `CO_3^(2-)`
What is the state of hybridisation of carbon in Diamond ?
What is the state of hybridisation of carbon in graphite?
Explain the difference in properties of diamond and graphite on the basis of their structures.
Rationalise the given statements and give chemical reactions:
• Lead(II) chloride reacts with Cl2 to give PbCl4.
• Lead(IV) chloride is highly unstable towards heat.
• Lead is known not to form an iodide, PbI4
Suggest reasons why the B–F bond lengths in BF3 (130 pm) and `BF_4^(-)` (143 pm) differ.
If B–Cl bond has a dipole moment, explain why BCl3 molecule has zero dipole moment.
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.
Suggest a reason as to why CO is poisonous.
How is an excessive content of CO2 responsible for global warming?
Explain Structures of Diborane and Boric Acid.
What happens when Borax is heated strongly
What happens when Boric acid is added to water
What happens when Aluminium is treated with dilute NaOH
What happens when BF3 is reacted with ammonia?
Explain the following reactions
Silicon is heated with methyl chloride at high temperature in the presence of copper
Explain the following reactions
Silicon dioxide is treated with hydrogen fluoride;
Explain the following reactions CO is heated with ZnO;
Explain the following reactions
Hydrated alumina is treated with aqueous NaOH solution.
Give reasons for Conc. HNO3 can be transported in aluminium container.
Give reasons: A mixture of dilute NaOH and aluminium pieces is used to open drain.
Give reasons: Graphite is used as a lubricant.
Give reasons: Diamond is used as an abrasive.
Give reasons: Aluminium alloys are used to make aircraft body.
Give reasons: Aluminium utensils should not be kept in water overnight.
Give reasons: Aluminium wire is used to make transmission cables.
Explain why is there a phenomenal decrease in ionisation enthalpy from carbon to silicon?
How would you explain the lower atomic radius of Ga as compared to Al?
What are allotropes? Sketch the structure of two allotropes of carbon namely diamond and graphite. What is the impact of structure on physical properties of two allotropes?
Classify following oxides as neutral, acidic, basic or amphoteric:
CO, B2O3, SiO2, CO2, Al2O3, PbO2, Tl2O3
Write suitable chemical equations to show their nature.
In some of the reactions thallium resembles aluminium, whereas in others it resembles with group I metals. Support this statement by giving some evidences.
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.
What do you understand by inert pair effect
What do you understand by Allotropy?
What do you understand by catenation?
A certain salt X, gives the following results.
(i) Its aqueous solution is alkaline to litmus.
(ii) It swells up to a glassy material Y on strong heating.
(iii) 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.
Write balanced equations for: BF3 + LiH →
Write balanced equations for: B2H6 + H2O →
Write balanced equations for: NaH + B2H6 →
Write balanced equations for:
Write balanced equations for: Al + NaOH →
Write balanced equations for: B2H6 + NH3 →
Give one method for industrial preparation and one for laboratory preparation of CO and CO2 each.
Boric acid is polymeric due to
(a) its acidic nature
(b) the presence of hydrogen bonds
(c) its monobasic nature
(d) its geometry
The type of hybridisation of boron in diborane is
Thermodynamically the most stable form of carbon is
Elements of group 14
(a) exhibit oxidation state of +4 only
(b) exhibit oxidation state of +2 and +4
(c) form M2– and M4+ ion
(d) form M2+ and M4+ ions
If the starting material for the manufacture of silicones is RSiCl3, write the structure of the product formed.
Textbook solutions for Class 11
NCERT solutions for Class 11 Chemistry chapter 11 - The p-Block Elements
NCERT solutions for Class 11 Chemistry chapter 11 (The p-Block Elements) include all questions with solution and detail explanation from Chemistry Textbook for Class 11 Part 2. 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 created the CBSE Chemistry Textbook for Class 11 Part 2 solutions in a manner that help students grasp basic concepts better and faster.
Further, we at shaalaa.com are providing such solutions so that students can prepare for written exams. These NCERT textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.
Concepts covered in Class 11 Chemistry chapter 11 The p-Block Elements are P-block Elements - Introduction, 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.
Using NCERT solutions for Class 11 Chemistry by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 11 prefer NCERT Textbook Solutions to score more in exam.
Get the free view of Class 11 Chemistry chapter 11 The p-Block Elements and can use shaalaa.com to keep it handy for your exam preparation