Class 11 Chemistry Chapter 11 The p-Block Elements MCQs

Class 11 chemistry MCQs with answers are provided here for chapter 11 The p-Block Elements. These MCQs are based on CBSE board curriculum and correspond to the most recent Class 11 chemistry syllabus. By practicing these Class 11 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 11 Annual examinations as well as other entrance exams such as NEET and JEE.

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Class 11 The p-Block Elements MCQs

1. In diborane molecule

(a) Four bridged hydrogens and two terminal hydrogens are present

(b) Two bridged hydrogens and four terminal hydrogens are present

(c) Three bridged hydrogens and three terminal hydrogens are present

(d) None of the above

Ans: (b)

Solution: Diborane has two bridged hydrogens and four terminal hydrogens.

2. Action of caustic soda on aluminium hydroxide gives a compound with formula.

(a) Al₂(OH)₄

(b) Na₂ Al(OH)₄

(c) NaAlO₂

(d) Na₃AlO₃

Ans: (c)

Solution: NaAlO₂ is formed in this reaction

3. In a borax bead test, which compound is formed?

(a) Orthoborate

(b) Metaborate

(c) Double oxide

(d) Tetraborate

Ans: (b)

Solution: In a borax bead test, metaborate is formed.

4. Inorganic graphite is ———–

(a) B₃N₃H₆

(b) B₃N₃

(c) SiC

(d) Fe(CO)₅

Ans: (b)

Solution: Structure of B₃N₃ is similar to that of graphite i.e, it has a layer structure consisting of hexagon rings.

5. Which of the following forces bind together carbon atoms in diamond?

(a) Ionic

(b) Covalent

(c) Dipolar

(d) van der Waals

Ans:(b)

Solution: Carbon atoms in diamond are linked to each other by covalent bonds.

6. The ion which can be precipitated by both HCl and H₂S is:

(a) Pb²⁺

(b) Fe³⁺

(c) Zn²⁺

(d) Cu²⁺

Ans: (a)

Solution: Pb²⁺ forms a precipitate of PbCl₂ and PbS.

7. In graphite, the electrons are

(a) localised on every third carbon atom.

(b) present in antibonding orbitals

(c) localised on each carbon atom

(d) spread out between the structure

Ans: (d)

Solution: Electrons are spread (delocalised) between the structures.

8. Which of the following molecular hydrides acts as a Lewis acid?

(a) NH₃

(b) H₂O

(c) B₂H₆

(d) CH₄

Ans: (c)

Solution: B₂H₆ acts as a Lewis acid since it is electron deficient in nature.

9. The basic structural unit of silicates is:

(a) SiO₄^2-

(b) SiO^–

(c) SiO₄^4-

(d) SO₃^2-

Ans: (c)

Solution: The basic structural unit of silicates is SiO₄^4- .

10. The increasing order of atomic radii of the following group 13 elements are:

(a) Al < Ga < In < Tl (b) Ga < Al < In < Tl

(c) Al < In < Ga < Tl (d) Al < Ga < Tl < In

Ans: (b)

Solution: The correct sequence of increasing atomic radii

Ga ( 135 pm) < Al (143 pm) < In (167 pm) < Tl (170 pm)

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