Class 11 Chemistry Chapter 11 The p Block Elements MCQ Questions with Answer

The p Block Elements Class 11 MCQ is one of the best strategies to prepare for the CBSE Class 11 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more MCQs on The p Block Elements Class 11, which will help them all through their board tests.

The p Block Elements Class 11 MCQ Questions and Answer

Class 11 Chemistry MCQ with answers are given here to Chapter 11 The p Block Elements. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 11 Chemistry syllabus. By Solving these Class 11 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 11 Annual exam.

Learn Class 11 The p Block Elements MCQs with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 11 Chemistry The p Block Elements MCQ with answers given below

Question 1. Which one of the following elements is unable to form MF₆ ^3– ion?
(a) Ga
(b) Al
(c) B
(d) In 

Question 2. The correct order of atomic radii in group 13 elements is
(a) B < Al < In < Ga < Tl
(b) B < Al < Ga < In < Tl
(c) B < Ga < Al < Tl < In
(d) B < Ga < Al < In < Tl 

Question 3. AlF₃ is soluble in HF only in presence of KF. It is due to the formation of
(a) K₃[AlF₃H₃]
(b) K₃[AlF₆]
(c) AlH₃
(d) K[AlF₃H]

Question 4. The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence
(a) Al < Ga < In < Tl
(b) Tl < In < Ga < Al
(c) In < Tl < Ga < Al
(d) Ga < In < Al < Tl

Question 5. Aluminium(III) chloride forms a dimer because aluminium
(a) belongs to 3rd group
(b) can have higher coordination number
(c) cannot form a trimer
(d) has high ionization energy.

Question 6. The type of hybridisation of boron in diborane is
(a) sp^3-hybridisation
(b) sp^2-hybridisation
(c) sp^–hybridisation
(d) sp³d^2-hybridisation.

Question 7. Which of the following statements about H₃BO₃ is not correct?
(a) It has a layer structure in which planar BO₃ units are joined by hydrogen bonds.
(b) It does not act as proton donor but acts as a Lewis acid by accepting hydroxyl ion.
(c) It is a strong tribasic acid.
(d) It is prepared by acidifying an aqueous solution of borax.

Question 8. The tendency of BF₃, BCl₃ and BBr₃ to behave as Lewis acid decreases in the sequence
(a) BCl₃ > BF₃ > BBr₃
(b) BBr₃ > BCl₃ > BF₃
(c) BBr₃ > BF₃ > BCl₃
(d) BF₃ > BCl₃ > BBr₃

Question 9. Which of the following structure is similar to graphite?
(a) B4C
(b) B₂H₆
(c) BN
(d) B 

Question 10. Boron compounds behave as Lewis acids, because of their
(a) ionisation property
(b) electron deficient nature
(c) acidic nature
(d) covalent nature.

Question 11. Boric acid is an acid because its molecule
(a) contains replaceable H⁺ ion
(b) gives up a proton
(c) accepts OH^– from water releasing proton
(d) combines with proton from water, molecule.

Question 12. Which of the following is incorrect statement ?
(a) SnF4 is ionic in nature.
(b) PbF4 is covalent in nature.
(c) SiCl4 is easily hydrolysed.
(d) GeX4 (X = F, Cl, Br, I) is more stable than GeX₂.

Question 13. Which of the following species is not stable?
(a) [SiCl₆]^2–
(b) [SiF₆]^2–
(c) [GeCl₆]^2–
(d) [Sn(OH)₆]^2–

Question 14. Carbon and silicon belong to (IV) group. The maximum coordination number of carbon in commonly occurring compounds is 4, whereas that of silicon is 6. This is due to
(a) availability of low lying d-orbitals in silicon
(b) large size of silicon
(c) more electropositive nature of silicon
(d) both (b) and (c).

Question 15. In graphite, electrons are
(a) localised on each C-atom
(b) localised on every third C-atom
(c) spread out between the structure
(d) present in antibonding orbital. 

Question 16. It is because of inability of ns² electrons of the valence shell to participate in bonding that
(a) Sn²⁺ is oxidising while Pb⁴⁺ is reducing
(b) Sn²⁺ and Pb²⁺ are both oxidising and reducing
(c) Sn⁴⁺ is reducing while Pb⁴⁺ is oxidising
(d) Sn²⁺ is reducing while Pb⁴⁺ is oxidising.

Question 17. Which of the following oxidation states are the most characteristic for lead and tin respectively?
(a) +2, +4
(b) +4, +4
(c) +2, +2
(d) +4, +2 

Question 18. Which of the following does not show electrical conduction?
(a) Diamond
(b) Graphite
(c) Potassium
(d) Sodium 

Question 19. Which of the following types of forces bind together the carbon atoms in diamond?
(a) Ionic
(b) Covalent
(c) Dipolar
(d) van der Waals 

Question 20. Which of the following is an insulator?
(a) Graphite
(b) Aluminium
(c) Diamond
(d) Silicon

Question 21. Identify the correct statements from the following :
(A) CO_2(g) is used as refrigerant for ice-cream and frozen food.
(B) The structure of C₆0 contains twelve six carbon rings and twenty five carbon rings.
(C) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline.
(D) CO is colourless and odourless gas.
(a) (A), (B) and (C) only
(b) (A) and (C) only
(c) (B) and (C) only
(d) (C) and (D) only 

Question 22. Which of the following anions is present in the chain structure of silicates?
(a) (Si₂O₅^2–)n
(b) (SiO₃^2–)n
(c) SiO₄  ^4–
(d) Si₂O₇ ^6– 

Question 23. Which one of the following statements about the zeolite is false?
(a) They are used as cation exchangers.
(b) They have open structure which enables themto take up small molecules.
(c) Zeolites are aluminosilicates having three dimensional network.
(d) Some of the SiO₄^4– units are replaced by AlO₄^5– and AlO₆ ^9– ions in zeolites. 

Question 24. Percentage of lead in lead pencil is
(a) 80
(b) 20
(c) zero
(d) 70 

Question 25. Which statement is wrong?
(a) Beryl is an example of cyclic silicate.
(b) Mg₂SiO₄ is orthosilicate.
(c) Basic structural unit in silicates is the SiO₄ tetrahedron.
(d) Feldspars are not aluminosilicates.

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Question 26. The straight chain polymer is formed by
(a) hydrolysis of CH₃SiCl₃ followed by condensation polymerisation
(b) hydrolysis of (CH₃)₄Si by addition polymerisation
(c) hydrolysis of (CH₃)₂SiCl₂ followed by condensation polymerisation
(d) hydrolysis of (CH₃)₃SiCl followed by condensation polymerisation.

Question 27. The basic structural unit of silicates is
(a) SiO₃^2–
(b) SiO₄ ^2–
(c) SiO^–
(d) SiO₄ ^4–

Question 28. Which of these is not a monomer for a high molecular mass silicone polymer?
(a) Me₃SiCl
(b) PhSiCl₃
(c) MeSiCl₃
(d) Me₂SiCl₂

Question 29. Name the two types of the structure of silicate in which one oxygen atom of [SiO4]4– is shared?
(a) Linear chain silicate
(b) Sheet silicate
(c) Pyrosilicate
(d) Three dimensional

Question 30. The non-metal oxides are ____x____ whereas metal oxides are ___y ____ in nature.           
(a) x = acidic or neutral, y = basic
(b) x = acidic, y = neutral
(c) x = basic, y = acidic
(d) x = neutral, y = basic

Question 31. The relationship between first, second and third ionisation enthalpies of each group-13 element is             
(a) Δ_iH₁ > Δ_iH₂ > Δ_iH₃
(b) Δ_iH₁ < Δ_iH₂ < Δ_iH₃
(c) Δ_iH₁ = Δ_iH₂ > Δ_iH₃
(d) Δ_iH₃ > Δ_iH₁ > Δ_iH₂

Question 32. The substance used as a smoke screen in warfare is
(a) SiCl₄
(b) PH₃
(c) PCl₅
(d) acetylene

Question 33. Which of the following compounds is used in cosmetic surgery?
(a) Silica
(b) Silicates
(c) Silicones
(d) Zeolites

Question 34. Which of the following is most abundant in the earth crust ?               
(a) Boron
(b) Aluminium
(c) Gallium
(d) Thallium

Question 35. Which of the following properties of aluminium makes it useful for food packaging ?               
(a) Good electrical conductivity
(b) Good thermal conductivity
(c) Low density
(d) Non toxicity

Question 36. Which of the following is/are true regarding gallium?             
(i) It has unusually low melting point (303 K).
(ii) It exist in liquid state during summer.
(iii) It has a high boiling point (2676 K).
The correct option is
(a) (i) and (ii)
(b) (i) and (iii)
(c) (i), (ii) and (iii)
(d) (ii) and (iii)

Question 37. The group 13 element that is liquid during summer and used for measuring high temperature is               
(a) Boron
(b) Aluminium
(c) Gallium
(d) Indium

Question 38. Thallium shows different oxidation states because                     
(a) it is transition element
(b) of inert pair effect
(c) of its amphoteric character
(d) of its higher reactivity

Question 39. Ionisation enthalpy (Δ_iH₁kJ mol^–1) for the elements of Group 13 follows the order.               
(a) B > Al > Ga > In > Tl
(b) B < Al < Ga < In < Tl
(c) B < Al > Ga < In > Tl
(d) B > Al < Ga > In < Tl

Question 40. Which of the following does not form M3+ ion?               
(a) Boron
(b) Aluminium
(c) Indium
(d) Gallium

Question 41. The element which shows least metallic character is                       
(a) Indium
(b) Boron
(c) Aluminium
(d) Gallium

Question 42. The strongest Lewis acid is                     
(a) BF₃
(b) BCl₃
(c) BBr₃
(d) BI₃

Question 43. AlCl₃ on hydrolysis gives                         
(a) Al2O₃. H₂O
(b) Al(OH)₃
(c) Al₂O₃
(d) AlCl3.6H₂O

Question 44. Which one of the following has the lowest m.p.?                   
(a) B
(b) Al
(c) Ga
(d) Tl

Question 45. The exhibition of highest co-ordination number depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as central atom n 3 MF₆³⁻ ?                     
(a) B
(b) Al
(c) Ga
(d) In

Question 46. Which out of the following compounds does not exist?                 
(a) BF₃
(b) TlCl₃
(c) TlCl₅
(d) Both (b) and (c)

Question 47. Aluminium chloride is a/an                       
(a) Bronsted – Lowery acid
(b) Arhenius acid
(c) Lewis acid
(d) Lewis base

Question 48. Boron forms covalent compound due to                 
(a) higher ionization energy
(b) lower ionization energy
(c) small size
(d) Both (a) and (c)

Question 49. Which metal is protected by a layer of its own oxide?                       
(a) Al
(b) Ag
(c) Au
(d) Fe

Question 50. Aluminium vessels should not be washed with materials containing washing soda because                   
(a) washing soda is expensive
(b) washing soda is easily decomposed
(c) washing soda reacts with aluminium to form soluble aluminate
(d) washing soda reacts with aluminium to form insoluble aluminium oxide

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