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

Explain why the following compounds behave as Lewis acids?

(i) BCl3

(ii) AlCl3

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8 months ago

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

Both BCl3 and AlCl3 are electron deficient compounds that are central atom boron and aluminium have incomplete Octet. In each compound, a metal atom is surrounded by six electrons of three covalent bonds with 3 chlorine atoms.

Each

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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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Alok Kumar Singh

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

(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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Alok Kumar Singh

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

(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.
AK
Alok Kumar Singh

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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