NEET > Some pBlock Elements

Explore popular questions from Some pBlock Elements for NEET. This collection covers Some pBlock Elements previous year NEET questions hand picked by popular teachers.


Q 1.    

Correct4

Incorrect-1

It is because of inability of {tex} n s ^ { 2 } {/tex} electrons of the valence shell to participate in bonding that

A

{tex} \mathrm { Sn } ^ { 2 + } {/tex} is oxidising while {tex} \mathrm { Pb } ^ { 4 + } {/tex} is reducing

B

{tex} \mathrm { Sn } ^ { 2 + } {/tex} and {tex} \mathrm { Pb } ^ { 2 + } {/tex} are both oxidising and reducing

C

{tex} \mathrm { Sn } ^ { 4 + } {/tex} is reducing while {tex} \mathrm { Pb } ^ { 4 + } {/tex} is oxidising

{tex} \mathrm { Sn } ^ { 2 + } {/tex} is reducing while {tex} \mathrm { Pb } ^ { 4 + } {/tex} is oxidising.

Explanation



Q 2.    

Correct4

Incorrect-1

Boric acid is an acid because its molecule

A

contains replaceable {tex} \mathrm { H } ^ { + } {/tex} ion

B

gives up a proton

accepts {tex}\mathrm {OH^{-}}{/tex} from water releasing proton

D

combines with proton from water molecule.

Explanation



Q 3.    

Correct4

Incorrect-1

{tex}\mathrm{AlF_{3}}{/tex} is soluble in {tex}\mathrm{HF}{/tex} only in presence of {tex}\mathrm{KF}{/tex}. It is due to the formation of

A

{tex} \mathrm { K } _ { 3 } \left[ \mathrm { AlF } _ { 3 } \mathrm { H } _ { 3 } \right] {/tex}

{tex} \mathrm { K } _ { 3 } \left[ \mathrm { AlF } _ { 6 } \right] {/tex}

C

{tex} \mathrm { AlH_{3} } {/tex}

D

{tex} \mathrm { K } \left[ \mathrm { AlF } _ { 3 } \mathrm { H } \right] {/tex}

Explanation



Q 4.    

Correct4

Incorrect-1

The stability of {tex} + 1 {/tex} oxidation state among {tex}\mathrm {Al, Ga, In}{/tex} and {tex}\mathrm{TI}{/tex} increases in the sequence

{tex} \mathrm { Al } < \mathrm { Ga } < \mathrm { In } < \mathrm { TI } {/tex}

B

{tex} \mathrm { TI } < \mathrm { In } < \mathrm { Ga } < \mathrm { Al } {/tex}

C

{tex} \mathrm { In } < \mathrm { TI } < \mathrm { Ga } < \mathrm { Al } {/tex}

D

{tex} \mathrm { Ga } < \mathrm { In } < \mathrm { Al } < \mathrm { TI } {/tex}

Explanation


Q 5.    

Correct4

Incorrect-1

Which of the following structure is similar to graphite?

A

{tex} \mathrm { B } _ { 4 } \mathrm { C } {/tex}

B

{tex} \mathrm { B } _ { 2 } \mathrm { H } _ { 6 } {/tex}

{tex} \mathrm { BN } {/tex}

D

{tex} \mathrm { B } {/tex}

Explanation


Q 6.    

Correct4

Incorrect-1

Which of these is not a monomer for a high molecular mass silicone polymer?

{tex} \mathrm { Me } _ { 3 } \mathrm { SiCl } {/tex}

B

{tex}\mathrm { PhSiCl_{3}}{/tex}

C

{tex} \mathrm { MeSiCl } _ { 3 } {/tex}

D

{tex} \mathrm { Me } _ { 2 } \mathrm { SiCl } _ { 2 } {/tex}

Explanation


Q 7.    

Correct4

Incorrect-1

The basic structural unit of silicates is

A

{tex} \mathrm { SiO } _ { 3 } ^ { 2- } {/tex}

B

{tex} \mathrm { SiO } _ { 4 } ^ { 2-} {/tex}

C

{tex}\mathrm {SiO^{-}}{/tex}

{tex} \mathrm { SiO } _ { 4 } ^ { 4- } {/tex}

Explanation


Q 8.    

Correct4

Incorrect-1

Which statement is wrong?

A

Beryl is an example of cyclic silicate.

B

{tex} \mathrm { Mg } _ { 2 } \mathrm { SiO } _ { 4 } {/tex} is orthosilicate.

C

Basic structural unit in silicates is the {tex}\mathrm{SiO_ 4}{/tex} tetrahedron.

Feldspars are not aluminosilicates.

Explanation



Q 9.    

Correct4

Incorrect-1

Name the two type of the structure of silicate in which one oxygen atom of {tex} \left[ \mathrm { SiO } _ { 4 } \right] ^ { 4- } {/tex} is shared?

A

Linear chain silicate

B

Sheet silicate

Pyrosilicate

D

Three dimensional

Explanation




Q 10.    

Correct4

Incorrect-1

Which of the following statements is incorrect?

A

Pure sodium metal dissolves in liquid ammonia to give blue solution.

B

{tex} \mathrm { NaOH } {/tex} reacts with glass to give sodium silicate.

Aluminium reacts with excess {tex} \mathrm { NaOH } {/tex} to give {tex} \mathrm { Al } ( \mathrm { OH } ) _ { 3 } {/tex}

D

{tex} \mathrm { NaHCO } _ { 3 } {/tex} on heating gives {tex} \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } {/tex}

Explanation



Q 11.    

Correct4

Incorrect-1

Which of the following oxide is amphoteric?

{tex} \mathrm { SnO } _ { 2 } {/tex}

B

{tex} \mathrm { CaO } {/tex}

C

{tex} \mathrm { SiO } _ { 2 } {/tex}

D

{tex} \mathrm { CO } _ { 2 } {/tex}

Explanation



Q 12.    

Correct4

Incorrect-1

Which one of the following molecular hydrides acts as a Lewis acid?

A

{tex} \mathrm { NH } _ { 3 } {/tex}

B

{tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex}

{tex} \mathrm { B } _ { 2 } \mathrm { H } _ { 6 } {/tex}

D

{tex} \mathrm { CH } _ { 4 } {/tex}

Explanation



Q 13.    

Correct4

Incorrect-1

The tendency of {tex} \mathrm { BF } _ { 3 } , \mathrm { BCl } _ { 3 } {/tex} and {tex} \mathrm { BBr } _ { 3 } {/tex} to behave as Lewis acid decreases in the sequence

A

{tex} \mathrm { BCl } _ { 3 } > \mathrm { BF } _ { 3 } > \mathrm { BBr } _ { 3 } {/tex}

{tex} \mathrm { BBr } _ { 3 } > \mathrm { BCl } _ { 3 } > \mathrm { BF } _ { 3 } {/tex}

C

{tex} \mathrm { BBr } _ { 3 } > \mathrm { BF } _ { 3 } > \mathrm { BCl } _ { 3 } {/tex}

D

{tex} \mathrm { BF } _ { 3 } > \mathrm { BCl } _ { 3 } > \mathrm { BBr } _ { 3 } {/tex}

Explanation





Q 14.    

Correct4

Incorrect-1

The straight chain polymer is formed by

A

hydrolysis of {tex} \mathrm { CH } _ { 3 } \mathrm { SiCl } _ { 3 } {/tex} followed by condensation polymerisation

B

hydrolysis of {tex} \left( \mathrm { CH } _ { 3 } \right) _ { 4 } \mathrm { Si } {/tex} by addition polymerisation

hydrolysis of {tex} \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { SiCl } _ { 2 } {/tex} followed by condensation polymerisation

D

hydrolysis of {tex} \left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { SiCl } {/tex} followed by condensation polymerisation.

Explanation



Q 15.    

Correct4

Incorrect-1

Which of the following oxidation states are the most characteristic for lead and tin respectively?

{tex} + 2, + 4 {/tex}

B

{tex} + 4 , + 4 {/tex}

C

{tex} + 2 , + 2 {/tex}

D

{tex} + 4 , + 2 {/tex}

Explanation



Q 16.    

Correct4

Incorrect-1

Which of the following anions is present in the chain structure of silicates?

A

{tex} \left( \mathrm { Si } _ { 2 } \mathrm { O } _ { 5 } ^ { 2- } \right)_{n} {/tex}

{tex} \left( \mathrm { SiO } _ { 3 } ^ { 2 } \right) _ { n } {/tex}

C

{tex} \mathrm { Si } \mathrm { O } _ { 4 } ^ { 4- } {/tex}

D

{tex} \mathrm { Si } _ { 2 } \mathrm { O } _ { 7 } ^ { 6- } {/tex}

Explanation



Q 17.    

Correct4

Incorrect-1

Which of the following is the most basic oxide?

A

{tex} \mathrm { SeO } _ { 2 } {/tex}

B

{tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } {/tex}

C

{tex} \mathrm { Sb } _ { 2 } \mathrm { O } _ { 3 } {/tex}

{tex} \mathrm { Bi } _ { 2 } \mathrm { O } _ { 3 } {/tex}

Explanation


Q 18.    

Correct4

Incorrect-1

The correct order regarding the electronegativity of hybrid orbitals of carbon is

A

{tex} s p < s p ^ { 2 } < s p ^ { 3 } {/tex}

B

{tex} s p > s p ^ { 2 } < s p ^ { 3 } {/tex}

{tex} s p > s p ^ { 2 } > s p ^ { 3 } {/tex}

D

{tex} s p < s p ^ { 2 } > s p ^ { 3 } {/tex}

Explanation


Q 19.    

Correct4

Incorrect-1

Which one of the following statements about the zeolite is false?

A

They are used as cation exchangers.

B

They have open structure which enables them to take up small molecules.

C

Zeolites are aluminosilicates having three dimensional network.

Some of the {tex} \mathrm { SiO } _ { 4 } ^ { 4 - } {/tex} units are replaced by {tex} \mathrm { AlO } _ { 4 } ^ { 5 - } {/tex} and {tex} \mathrm { AlO } _ { 6 } ^ { 9- } {/tex} ions in zeolites.

Explanation


Q 20.    

Correct4

Incorrect-1

Which one of the following compounds is not a protonic acid?

{tex} \mathrm { B } ( \mathrm { OH } ) _ { 3 } {/tex}

B

{tex} \mathrm { PO } ( \mathrm { OH } ) _ { 3 } {/tex}

C

{tex} \mathrm { SO } ( \mathrm { OH } )_{2} {/tex}

D

{tex} \mathrm { SO } _ { 2 } ( \mathrm { OH } ) _ { 2 } {/tex}

Explanation


Q 21.    

Correct4

Incorrect-1

Which compound is electron deficient?

A

{tex} \mathrm { BeCl } _ { 2 } {/tex}

{tex} \mathrm { BCl _ { 3 }} {/tex}

C

{tex} \mathrm { CCl } _ { 4 } {/tex}

D

{tex} \mathrm { PCl } _ { 5 } {/tex}

Explanation


Q 22.    

Correct4

Incorrect-1

Which of the following does not show electrical conduction?

Diamond

B

Graphite

C

Potassium

D

Sodium

Explanation


Q 23.    

Correct4

Incorrect-1

The type of hybridisation of boron in diborane is

{tex} s p ^ { 3 } {/tex} -hybridisation

B

{tex} s p ^ { 2 } {/tex} -hybridisation

C

{tex}sp{/tex}-hybridisation

D

{tex} s p ^ { 3 } d ^ { 2 } - {/tex} hybridisation

Explanation


Q 24.    

Correct4

Incorrect-1

Percentage of lead in lead pencil is

A

80

B

20

Zero

D

70

Explanation


Q 25.    

Correct4

Incorrect-1

In graphite, electrons are

A

localised on each C-atom

localised on every third C-atom

C

spread out between the structure

D

present in anti-bonding orbital.

Explanation