NCERT Class 11 Chemistry Chapter 11 p Block Elements MCQ

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1. The non-metal oxides are ____x____ whereas metal oxides are ___y ____ in nature.

A. x = acidic or neutral, y = basic

B. x = neutral, y = basic

C. x = acidic, y = neutral

D. x = basic, y = acidic

2. Which of the following is most abundant in the earth crust ?

A. Aluminium

B. Thallium

C. Boron

D. Gallium

3. Which of the following properties of aluminium makes it useful for food packaging ?

A. Low density

B. Nontoxicity

C. Good thermal conductivity

D. Good electrical conductivity

4. 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), (ii) and (iii)

B. (i) and (ii)

C. (i) and (iii)

D. (ii) and (iii)

5. The element which shows least metallic character is

A. Boron

B. Gallium

C. Indium

D. Aluminium

6. Which one of the following has the lowest m.p.?

A. Ga

B. B

C. Al

D. Tl

7. Which of the following does not form M³⁺ ion?

A. Boron

B. Indium

C. Aluminium

D. Gallium

8. The group 13 element that is liquid during summer and used for measuring high temperature is

A. Gallium

B. Boron

C. Aluminium

D. Indium

9. Thallium shows different oxidation states because

A. of inert pair effect

B. of its amphoteric character

C. of its higher reactivity

D. it is transition element

10. Aluminium chloride is a/an

A. Lewis acid

B. Bronsted - Lowery acid

C. Arhenius acid

D. Lewis base

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11. The strongest Lewis acid is

A. BI₃

B. BCl₃

C. BF₃

D. BBr₃

12. Which metal is protected by a layer of its own oxide?

A. Al

B. Au

C. Ag

D. Fe

13. Aluminium vessels should not be washed with materials containing washing soda because

A. washing soda reacts with aluminium to form soluble aluminate

B. washing soda reacts with aluminium to form insoluble aluminium oxide

C. washing soda is easily decomposed

D. washing soda is expensive

14. When Al is added to KOH solution

A. hydrogen is evolved

B. oxygen is evolved

C. no action takes place

D. water is produced

15. Which of the following does not react with aqueous NaOH ?

A. B

B. Al

C. Ga

D. Tl

16. Boron forms a covalent compound due to

A. Both

B. higher ionization energy

C. small size

D. None of these

17. NH₃ and BF₃ form an adduct readily because they form

A. a coordinate bond

B. an ionic bond

C. a hydrogen bond

D. a covalent bond

18. In borax bead test which compound is formed?

A. Meta-borate

B. Tetra-borate

C. Ortho-borate

D. Double oxide

19. Boric acid is polymeric due to

A. the presence of hydrogen bonds

B. its acidic nature

C. its monobasic nature

D. its geometry

20. Orthoboric acid when heated to red hot gives

A. pyroboric acid

B. boric anhydride

C. metaboric acid

D. boron and water

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21. Red phosphorus is chemically less reactive because

A. It does not contain P – P bonds

B. It dos not contain tetrahedral P₄ molecules

C. It does not catch fire in air even upto 400°C

D. It has a polymeric structure

22. Which of the following will not produce hydrogen gas?

A. Reaction between Fe and dil. HCl

B. Reaction between Zn and NaOH

C. Reaction between Zn and conc. H₂SO₄

D. Electrolysis of NaCl in Nelsons cell

23. Which of the following statement is correct?

A. Copper (I) metaborate is colourless

B. Copper (II) metaborate is colourless

C. Copper (II) metaborate is light green

D. Copper (I) metaborate is dark green

24. The structure of diBorane contains

A. Four 2c – 2e bonds and two 3c – 2e bonds

B. Two 2c – 2e bonds and two 3c – 2e bonds

C. Two 2c – 2e bonds and two 3c – 3e bonds

D. Four 2c – 2e bonds and four 3c – 2e bonds

25. Which is not the correct statement for Boron?

A. It exhibits Allotropy

B. It exists in both crystalline and Amorphous form

C. It forms solid chlorides

D. It forms volatile hydrides.