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NCERT Exemplar · Class 11 · Chemistry

Chapter 11: The p-Block Elements

Practice each question, then open the answer or worked solution.

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II. Multiple Choice Questions (Type-II)

25 questions
Q36Written answer

Match the species given in Column I with the properties mentioned in

Column II.

Column I (i) BF4–

(ii) AlCl3 (iii) SnO (iv) PbO2

Column II

(a) The oxidation state of the central atom is +4

(b) Strong oxidising agent

(c) Lewis acid

(d) Can be further oxidised

(e) Tetrahedral shape
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Worked solution

(i) is e

(ii) is c

(iii) is d

(iv) is a,b

Q37Written answer

Match the species given in Column I with properties given in Column II.

Column I

(i) Diborane

(ii) Gallium

(iii) Borax

(iv) Aluminosilicate

(v) Quartz

Column II

(a) Used as a flux for soldering metals

(b) The crystalline form of silica

(c) Banana bonds

(d) Low melting, high boiling, useful for measuring high temperatures

(e) Used as a catalyst in petrochemical industries

 
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Worked solution

(i) is c

(ii) is d

(iii) is a

(iv) is e

(v) is b

Q38Written answer

Match the species given in Column I with the hybridisation given in Column II.

Column I

(i) Boron in [B(OH)4]–

(ii) Aluminium in [Al(H2O)6]3+

(iii) Boron in B2H6

(iv) Carbon in Buckminsterfullerene

(v) Silicon in SiO44–

(vi) Germanium in [GeCl6]2–

 Column II

(a) sp2

(b) sp3

(c) sp3d2
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Worked solution

(i) is b

(ii) is c

(iii) is b

(iv) is a

(v) is b

(vi) is c

V. Assertion and Reason Type

In the following questions, a statement of Assertion (A) followed by a statement

of Reason (R) is given. Choose the correct option out of the choices given

below each question.

Q39Written answer

Assertion (A): If aluminium atoms replace a few silicon atoms in three

the dimensional network of silicon dioxide, the overall structure

acquires a negative charge.

Reason (R): Aluminium is trivalent while silicon is tetravalent.

(i) Both A and R are correct and R is the correct explanation of A.

(ii) Both A and R are correct but R is not the correct explanation of A.

(iii) Both A and R are not correct

(iv) A is not correct but R is correct.

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Worked solution

Option (i) is correct.

Q40Written answer

Assertion (A): Silicons are water-repelling in nature.

Reason (R): Silicons are organosilicon polymers, which have (–R2SiO–) as

repeating unit.

(i) A and R both are correct and R is the correct explanation of A.

(ii) Both A and R are correct but R is not the correct explanation of A.

(iii) A and R both are not true.

(iv) A is not true but R is true.

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Worked solution

Option (ii) is correct.

Important Concepts of Class 11 Chemistry Chapter 11 The p-Block Elements

  1. Group 13 Elements: The Boron Family
    1. Electronic Configuration
    2. Atomic Radii
    3. Ionisation Enthalpy
    4. Electronegativity
    5. Physical Properties
    6. Chemical Properties
  2. Important Trends and Anomalous Properties of Boron
  3. Some Important Compounds of Boron
    1. Borax
    2. Orthoboric Acid
    3. Diborane, B2h6
  4. Uses of Boron and Aluminium and Their Compounds
  5. Group 14 Elements: The Carbon Family
    1. Electronic Configuration
    2. Covalent Radius
    3. Ionization Enthalpy
    4. Electronegativity
    5. Physical Properties
    6. Chemical Properties
  6. Important Trends and Anomalous Behaviour of Carbon
  7. Allotropes of Carbon
    1. Diamond
    2. Graphite
    3. Fullerenes
    4. Uses of Carbon
  8. Some Important Compounds of Carbon and Silicon
    1. Carbon Monoxide
    2. Carbon Dioxide
    3. Silicon Dioxide, Si02
    4. Silicones
    5. Silicates
    6. Zeolites

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