The small increase in the covalent radii from $\mathrm{Si}$ to $\mathrm{Pb}$ is due to the presence of

half-filled $d$-orbitals in heavier members

presence of completely filled $d$-orbitals in lighter members

${\rm{A}}{{\rm{l}}_2}{{\rm{O}}_3}{\rm{.}}{{\rm{H}}_2}{\rm{O}}$

${\rm{A}}{{\rm{l}}_2}{\left( {{\rm{S}}{{\rm{O}}_4}} \right)_3}$

Conversion of white to grey tin

Conversion of white tetrahedral tin to white rhombohedral tin

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JEE • CHEMISTRY • 14 TH GROUP ELEMENTS (P-BLOCK)

14 th group elements (p-block) practice · Mixed difficulty

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 151-180 of 197 questions

151 Easy

151 of 197

Analyzing +4 | -1

Which of the following is not isostructural with

Si{F_4}

View answer and explanation

Correct option: A

S{F_4}

The correct answer is A (SF4) because SiF4, ClO4-, XeO4, and CCl4 are all tetrahedral, while SF4 has a see-saw shape due to the presence of a lone pair on the sulfur atom.

152 Easy

152 of 197

Understanding +4 | -1

Which among the following does not show catenation?

View answer and explanation

Correct option: C

\mathrm{Pb}

Option C (

\mathrm{Pb}

) is correct because lead does not exhibit catenation due to its large size and weak bonding.

153 Medium

153 of 197

Remembering +4 | -1

In the sale of diamonds the unit of weight is carat. One carat is equal to:

View answer and explanation

Correct option: A

100 mg

Option D (200 mg) is correct because one carat, the unit of weight for diamonds, is equal to 200 milligrams.

154 Easy

154 of 197

Remembering +4 | -1

Bell metal is an alloy of :

View answer and explanation

Correct option: B

Cu + Sn

Option B (Cu + Sn) is correct because bell metal is an alloy primarily composed of copper and tin.

155 Medium

155 of 197

Remembering +4 | -1

The major component/ingredient of Portland cement is

View answer and explanation

Correct option: B

tricalcium silicate

Option B is correct because tricalcium silicate (3CaO.SiO2) is the major component of Portland cement, contributing to its strength and hardening properties.

156 Easy

156 of 197

Remembering +4 | -1

Silicon is usually found in :

View answer and explanation

Correct option: A

Sand

Option A (Sand) is correct because sand is primarily composed of silica (

\mathrm{SiO}_2

), which is a compound of silicon and oxygen.

157 Medium

157 of 197

Remembering +4 | -1

Which of the following is the amorphous form of silica used in filtration plants?

View answer and explanation

Correct option: D

Kieselguhr

Option D (Kieselguhr) is correct because Kieselguhr, an amorphous form of silica, is used in filtration plants due to its porous nature.

158 Easy

158 of 197

Remembering +4 | -1

The main constituents of coal gas are:

View answer and explanation

Correct option: A

\mathrm{C}{\mathrm{H}_4} + \mathrm{CO} + {\mathrm{H}_2}

Option A (

\mathrm{C}{\mathrm{H}_4} + \mathrm{CO} + {\mathrm{H}_2}

) is correct because coal gas primarily consists of methane, carbon monoxide, and hydrogen.

159 Easy

159 of 197

Remembering +4 | -1

In laboratory silicon can be prepared by the reaction

View answer and explanation

Correct option: A

Silica with magnesium

Option A (Silica with magnesium) is correct because silicon can be prepared in the laboratory by reducing silica (SiO2) with magnesium.

160 Medium

160 of 197

Understanding +4 | -1

The small increase in the covalent radii from

\mathrm{Si}

\mathrm{Pb}

is due to the presence of

View answer and explanation

Correct option: B

completely filled

d

and

f

-orbitals in heavier members

Option B is correct because the presence of completely filled d and f orbitals in heavier members causes poor shielding, leading to a smaller increase in covalent radii than expected.

161 Easy

161 of 197

Remembering +4 | -1

The silicon compound which is used as lubricant and in cosmetic implant is

View answer and explanation

Correct option: C

Silicone

The correct answer is C (Silicone) because silicones are widely used as lubricants and in cosmetic implants due to their properties.

162 Medium

162 of 197

Remembering +4 | -1

Which fuel has the highest calorific value?

View answer and explanation

Correct option: A

Coal gas

Option A (Coal gas) is correct because coal gas generally has a higher calorific value compared to water gas, producer gas, and carbon dioxide gas.

163 Easy

163 of 197

Remembering +4 | -1

Which is correct oxidation state of lead?

View answer and explanation

Correct option: D

#ERROR!

Option D (+2, +4) is correct because lead exhibits +2 and +4 oxidation states due to the inert pair effect.

164 Medium

164 of 197

Analyzing +4 | -1

Which of the following has the minimum heat of dissociation?

View answer and explanation

Correct option: D

[{\left( {\mathrm{C}{\mathrm{H}_3}} \right)_3}\mathrm{N} \to \mathrm{B}{\left( {\mathrm{C}{\mathrm{H}_3}} \right)_3}]

Option D (

[{\left( {\mathrm{C}{\mathrm{H}_3}} \right)_3}\mathrm{N} \to \mathrm{B}{\left( {\mathrm{C}{\mathrm{H}_3}} \right)_3}]

) is correct because the steric hindrance is greatest in this option, leading to the weakest interaction and thus the minimum heat of dissociation.

165 Easy

165 of 197

Remembering +4 | -1

Glass reacts with HF to produce

View answer and explanation

Correct option: B

\mathrm{Si}{\mathrm{F}_4}

Option B (

\mathrm{Si}{\mathrm{F}_4}

) is correct because silicon dioxide in glass reacts with hydrofluoric acid to form silicon tetrafluoride and water.

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166 Medium

166 of 197

Analyzing +4 | -1

Select Incorrect reaction ?

View answer and explanation

Correct option: B

\mathrm{H}_3 \mathrm{BO}_3 \stackrel{\Delta}{\rightarrow} \mathrm{HBO}_2

Option A (

{A}=

Excess,

{B}=

Excess) is incorrect. Option B (

{A}=

Limited,

{B}=

Excess) is correct because with limited Cl₂, NH₃ is in excess, while with excess Cl₂, NH₃ is limiting.

167 Easy

167 of 197

Remembering +4 | -1

Carborundum is

View answer and explanation

Correct option: A

\mathrm{SiC}

Option A (

\mathrm{SiC}

) is correct because Carborundum is the common name for silicon carbide, which has the formula

\mathrm{SiC}

168 Medium

168 of 197

Remembering +4 | -1

What is the state of hybridization of carbon in fullerene?

View answer and explanation

Correct option: A

s{p^2}

Option A (

s{p^2}

) is correct because each carbon atom in fullerene is bonded to three other carbon atoms, resulting in

s{p^2}

hybridization.

169 Medium

169 of 197

Understanding +4 | -1

\mathrm{Si}{\mathrm{H}_4} + {\mathrm{O}_2}

mixture on bubbling through water and bubbles coming in contact with air:

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because silane (

\mathrm{Si}{\mathrm{H}_4}

) reacts with oxygen to form silica and water, which can burn with a luminous flame and produce vortex rings of silica.

170 Easy

170 of 197

Remembering +4 | -1

Which element has a limited coordination number of four?

View answer and explanation

Correct option: B

Option C (Si) is incorrect. Option B (C) is correct because carbon, due to the absence of available d-orbitals in its valence shell, cannot expand its octet and thus has a maximum coordination number of four.

171 Medium

171 of 197

Analyzing +4 | -1

Select correct statement(s).

View answer and explanation

Correct option: D

All of the above.

Option D is correct because all the given statements about cyanamide ion, Mg₂C₃, and CaC₂ are correct.

172 Easy

172 of 197

Understanding +4 | -1

Which is not a characteristic property of carbon?

View answer and explanation

Correct option: C

Availability of d-orbitals for bonding

Option C (Availability of d-orbitals for bonding) is correct because carbon, being a second-period element, does not have d-orbitals available for bonding.

173 Easy

173 of 197

Remembering +4 | -1

The inert form of carbon is:

View answer and explanation

Correct option: A

Diamond

Option A (Diamond) is correct because diamond has a strong, rigid tetrahedral structure, making it chemically inert.

174 Medium

174 of 197

Remembering +4 | -1

The blue coloured mineral ‘Lapis Lazuli’ used as semiprecious stone is:

View answer and explanation

Correct option: A

Sodium alumino silicate

Option A (Sodium alumino silicate) is correct because Lapis Lazuli is a complex mineral primarily composed of sodium alumino silicate.

175 Hard

175 of 197

Remembering +4 | -1

Tin cry refers to :

View answer and explanation

Correct option: D

Emission of sound while bending a tin rod

Option D (Emission of sound while bending a tin rod) is correct because tin cry refers to the characteristic sound produced when a tin rod is bent.

176 Medium

176 of 197

Analyzing +4 | -1

\mathrm{C}(\text {diamond})\rightarrow \mathrm{C}(\text {graphite})+\mathrm{X} \mathrm{~kJ} \mathrm{~mol}^{-1}

\begin{aligned} & \mathrm{C}(\text {diamond})+\mathrm{O}_2(\mathrm{g}) \rightarrow \mathrm{CO}_2(\mathrm{g})+\mathrm{Y} \mathrm{~kJ} \mathrm{~mol}^{-1} \\ & \mathrm{C}(\text {graphite})+\mathrm{O}_2(\mathrm{g}) \rightarrow \mathrm{CO}_2(\mathrm{g})+\mathrm{Z~kJ} \mathrm{~mol}^{-1} \end{aligned}

At constant temperature. Then

View answer and explanation

Correct option: D

X = Y – Z

Option D (X = Y – Z) is correct because it is derived from Hess's Law by manipulating the given thermochemical equations.

177 Medium

177 of 197

Remembering +4 | -1

The anion present in the cyclic structure of silicates is

View answer and explanation

Correct option: C

{SiO}_3^{2-}

Option C (

{SiO}_3^{2-}

) is correct because it represents the basic repeating unit in cyclic silicates where two oxygen atoms are shared.

178 Medium

178 of 197

Understanding +4 | -1

Tungsten carbides is an example of:

View answer and explanation

Correct option: D

Interstitial solid solution

Option D is correct because tungsten carbides are formed when small carbon atoms occupy the interstitial spaces within the tungsten lattice structure, making it an interstitial solid solution.

179 Medium

179 of 197

Remembering +4 | -1

Colour is imparted to glass by mixing:

View answer and explanation

Correct option: B

Metal oxides

Option B (Metal oxides) is correct because the addition of different metal oxides to glass during its production imparts various colors.

180 Medium

180 of 197

Remembering +4 | -1

The compound that is white in colour is

View answer and explanation

Correct option: B

lead sulphate

Option B (lead sulphate) is correct because lead sulphate is a white solid.

Revision notes and key takeaways

Review 14 TH GROUP ELEMENTS (P-BLOCK) in your textbook or class notes, then use this set to check your understanding.

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