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Class 11thChemistry NCERT Exemplar Solutions Class 11th Chapter ElevenThe P Block ElementsChemistry

Describe the general trends in the following properties of the elements in Groups 13 and 14. 

(i) Atomic size

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This is a Long Answers Type Questions as classified in NCERT Exemplar

Grp-13 The atomic size of the boron family follows the irregular trend. Generally, down the group the size increases but Gallium has a smaller atomic radius than Aluminium due to the poor shielding effect of 3d-orbitals.

Order: B

Gr

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Assertion (A): Silicones are water repelling in nature.

Reason (R): Silicones are organosilicon polymers, which have (-R2SiO-) as repeating unit.

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

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

(C) Both A and R are not correct. 

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

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(B)

Silicones are a class of silicon polymers that contain the repeating unit (-R 2 SiO-). Silicones are water repellent in nature because they are surrounded by non-polar alkyl groups, so A and R are both correct, but R is

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Assertion (A): If aluminium atoms replace a few silicon atoms in three dimensional network of silicon dioxide, the overall structure acquires a negative charge.

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

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

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

(C) Both A and R are not correct.

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

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(A)

In aluminium silicate, silicon is doped with group 13 elements and as aluminium is trivalent and silicon is tetravalent so, on replacing aluminium by Silicon, a negatively charged structure will be obtained. Both the st

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

(i) Boron in [B(OH)4]−

(a) sp2

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

(b) sp3

(iii) Boron in B2H6

(c) sp3d2

(iv) Carbon in Buckminsterfullerene

  

(v) Silicon in SiO44−

  

(vi) Germanium in [GeCl6]2−

  
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This is a Matching Type Questions as classified in NCERT Exemplar

(i)→ (b), (ii) → (c), (iii) → (b), (iv) → (a) (v)→ (b) (vi)→ (c)

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

Column I

Column II

(i) Diborane

(a) Used as a flux for soldering metals

(ii) Gallium

(b) Crystalline form of silica

(iii) Borax 

(c) Banana bonds

(iv) Aluminosilicate

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

(v) Quartz

(e) Used as catalyst in petrochemical industries.
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This is a Matching Type Questions as classified in NCERT Exemplar

(i)→ (c) (ii)→ (d) (iii)→ (a) (iv)→ (e) (v)→ (b)

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

Column I

Column II

(i) BF4−

(a) Oxidation state of central atom is +4

(ii) AlCl3

(b) Strong oxidising agent

(iii) SnO

(c) Lewis acid

(iv) PbO2

(d) Can be further oxidised
 

(e) Tetrahedral shape
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(i)- (e), (ii)- (c), (iii)- (d), (iv)- (a) & (b)

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Chemistry NCERT Exemplar Solutions Class 11th Chapter Eleven 2025

Chemistry NCERT Exemplar Solutions Class 11th Chapter Eleven 2025

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