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

Which of the following statements are correct?

(A) Fullerenes have dangling bonds.

(B) Fullerenes are cage-like molecules.

(C) Graphite is thermodynamically most stable allotrope of carbon.

(D) Graphite is slippery and hard and therefore used as a dry lubricant in machines.

2 Views|Posted 8 months ago
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1 Answer
A
8 months ago

This is a Multiple Choice Questions as classified in NCERT Exemplar

(B) & (C)

(B) Fullerene is an allotrope of carbon consisting of 60 carbon atoms bonded together through single and double bonds in such a manner that they form a hollow sphere like shape or a cage-like structure.

(C) In graphite, ea

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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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Alok Kumar Singh

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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This is a Matching Type Questions as classified in NCERT Exemplar

(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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