In This Post we are  providing Chapter-4 The p-block Elements NCERT MCQ for Class 11 Chemistry which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON THE p-BLOCK ELEMENTS

Question 1 :  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)

Answer :  (i), (ii) and (iii)

Question 2 :  The element which shows least metallic character is

  • a) Boron
  • b) Gallium
  • c) Indium
  • d) Aluminium

Answer :  Boron

Question 3 :  Which one of the following has the lowest m.p.?

  • a) Ga
  • b) B
  • c) Al
  • d) Tl

Answer :  Ga

Question 4 :  Which of the following does not form M3+ ion?

  • a) Boron
  • b) Indium
  • c) Aluminium
  • d) Gallium

Answer :  Boron

Question 5:  The group 13 element that is liquid during summer and used for measuring high temperature is

  • a) Gallium
  • b) Boron
  • c) Aluminium
  • d) Indium

Answer :  Gallium

Question 6:  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

Answer :  of inert pair effect

Question 7 :  Aluminium chloride is a/an

  • a) Lewis acid
  • b) Bronsted – Lowery acid
  • c) Arhenius acid
  • d) Lewis base

Answer :  Lewis acid

Question 8 :  The strongest Lewis acid is

  • a) BI3
  • b) BCl3
  • c) BF3
  • d) BBr3

Answer :  BI3

Question 9 :  Which metal is protected by a layer of its own oxide?

  • a) Al
  • b) Au
  • c) Ag
  • d) Fe

Answer :  Al

Question 10 :  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

Answer :  washing soda reacts with aluminium to form soluble aluminate

Question 11 :  When Al is added to KOH solution

  • a) hydrogen is evolved
  • b) oxygen is evolved
  • c) no action takes place
  • d) water is produced

Answer :  hydrogen is evolved

Question 12:  Which of the following does not react with aqueous NaOH ?

  • a) B
  • b) Al
  • c) Ga
  • d) Tl

Answer :  B

Question 13 :  In borax bead test which compound is formed?

  • a) Meta-borate
  • b) Tetra-borate
  • c) Ortho-borate
  • d) Double oxide

Answer :  Meta-borate

Question 14 :  Boric acid is polymeric due to

  • a) the presence of hydrogen bonds
  • b) its acidic nature
  • c) its monobasic nature
  • d) its geometry

Answer :  the presence of hydrogen bonds

Question 15 :  Orthoboric acid when heated to red hot gives

  • a) pyroboric acid
  • b) boric anhydride
  • c) metaboric acid
  • d) boron and water

Answer :  pyroboric acid

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