Explain the following: (A) CO2 is a gas whereas SiO2 is a solid. (B) Silicon forms SiF62− ion whereas corresponding fluoro-compound of carbon is not known.

This is a Short Answers Type Questions as classified in NCERT Exemplar (A) Carbon has small size and large electronegativity, it forms strong n−pπ bonding with two oxygen atoms forming a separate CO2 molecule. While in SiO2 silicon is larger in size with comparatively less electronegativity than carbon it shows no tendency to form n−pπ bonding rather forms Single covalent bond with oxygen. Thus, SiO2 possess 3D network-like structure in which each Silicon is bonded to 4 oxygen atoms. (B) Carbon is smaller in size and lacks d-orbitals hence can have a maximum coordination number of four and sp3 hybridisation only. Whereas Silicon has d-orbital, it can amplify its hybridisation up to sp3d2 (CN=6) and can complete its Octet. Therefore, Silicon forms SiF62−. whereas the corresponding flugre-compound of carbon is not known.

Explain the following:

(A) CO₂ is a gas whereas SiO₂ is a solid.

(B) Silicon forms SiF₆²⁻ ion whereas corresponding fluoro-compound of carbon is not known.

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Alok Kumar Singh | Contributor-Level 10

8 months ago

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

(A) Carbon has small size and large electronegativity, it forms strong n−pπ bonding with two oxygen atoms forming a separate CO₂ molecule.

While in SiO₂ silicon is larger in size with comparatively less electronegativity than car

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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.

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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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

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.

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

Alok Kumar Singh

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

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(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⁻

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.

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