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JEE Advanced > pBlock Elements

Explore popular questions from pBlock Elements for JEE Advanced. This collection covers pBlock Elements previous year JEE Advanced questions hand picked by experienced teachers.

Q 1.

Correct4

Incorrect-1

The reddish brown coloured gas formed when nitric oxide is oxidised by air is

A

{tex} \mathrm { N } _ { 2 } \mathrm { O } _ { 5 } {/tex}

B

{tex} \mathrm { N } _ { 2 } \mathrm { O } _ { 4 } {/tex}

{tex} \mathrm { NO } _ { 2 } {/tex}

D

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

Explanation

Q 2.

Correct4

Incorrect-1

A solution of {tex}\mathrm{KBr}{/tex} is treated with each of the following. Which one would liberate bromine

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

B

{tex} \mathrm { HI } {/tex}

C

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

D

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

Explanation

Q 3.

Correct4

Incorrect-1

Which of the following is coloured

A

{tex} \mathrm { NO } {/tex}

B

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

C

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

None

Explanation

Q 4.

Correct4

Incorrect-1

Lead pencil contains

A

{tex} \mathrm { Pb } {/tex}

B

{tex} \mathrm { FeS } {/tex}

Graphite

D

{tex} \mathrm { PbS } {/tex}

Q 5.

Correct4

Incorrect-1

{tex} \mathrm { HBr } {/tex} and {tex} \mathrm {HI } {/tex} reduce sulphuric acid, {tex} \mathrm {HCl } {/tex} can reduce {tex}\mathrm{ KMnO} _ { 4 } {/tex} and {tex} \mathrm {HF } {/tex} can reduce

A

{tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex}

B

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

C

{tex} \mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex}

None of the above

Explanation

Q 6.

Correct4

Incorrect-1

Which of the following statements about anhydrous aluminium chloride is correct?

A

it exists as {tex} \mathrm { AlCl } _ { 3 } {/tex} molecules

B

it is not easily hydrolysed

it sublimes at {tex} 100 ^ { \circ } \mathrm { C } {/tex} under vacuum

D

it is a strong Lewis base

Explanation

Q 7.

Correct4

Incorrect-1

Bromine can be liberated from potassium bromide solution by the action of

A

Iodine solution

Chlorine water

C

Sodium chloride

D

Potassium iodide

Explanation

Q 8.

Correct4

Incorrect-1

{tex} \ln \mathrm { P } _ { 4 } \mathrm { O } _ { 10 } {/tex} each {tex} \mathrm { P } {/tex} atom is linked with....... {tex} \mathrm {O } {/tex} atoms

A

2

B

3

4

D

5

Explanation

Q 9.

Correct4

Incorrect-1

Electrolytic reduction of alumina to aluminium by Hall- Heroult process is carried out

A

in the presence of {tex} \mathrm {NaCl} {/tex}

B

in the presence of fluorite

in the presence of cryolite which forms a melt with lower melting temperature

D

in the presence of cryolite which forms a melt with higher melting temperature

Explanation

Q 10.

Correct4

Incorrect-1

Ammonia can be dried by

A

conc. {tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex}

B

{tex} \mathrm { P } _ { 4 } \mathrm { O } _ { 10 } {/tex}

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

D

anhydrous {tex} \mathrm { CaCl } _ { 2 } {/tex}

Explanation

Q 11.

Correct4

Incorrect-1

For {tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 3 } {/tex} and {tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 4 } {/tex} the correct choice is:

{tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 3 } {/tex} is dibasic and reducing

B

{tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 3 } {/tex} is dibasic and non-reducing

C

{tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 4 } {/tex} is tribasic and reducing

D

{tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 3 } {/tex} is tribasic and non-reducing

Explanation

Q 12.

Correct4

Incorrect-1

Extra pure {tex} \mathrm { N } _ { 2 } {/tex} can be obtained by heating

A

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

B

{tex} \mathrm { NH } _ { 4 } \mathrm { NO } _ { 3 } {/tex}

C

{tex} \left( \mathrm { NH } _ { 4 } \right) _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex}

{tex} \mathrm { Ba } \left( \mathrm { N } _ { 3 } \right) _ { 2 } {/tex}

Explanation

Q 13.

Correct4

Incorrect-1

Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?

A

{tex} \mathrm { HNO } _ { 3 } , \mathrm { NO } , \mathrm { NH } _ { 4 } \mathrm { Cl } , \mathrm { N } _ { 2 } {/tex}

{tex} \mathrm { HNO } _ { 3 } , \mathrm { NO } , \mathrm { N } _ { 2 } , \mathrm { NH } _ { 4 } \mathrm { Cl } {/tex}

C

{tex} \mathrm { HNO } _ { 3 } , \mathrm { NH } _ { 4 } \mathrm { Cl } , \mathrm { NO } , \mathrm { N } _ { 2 } {/tex}

D

{tex} \mathrm { NO } , \mathrm { HNO } _ { 3 } , \mathrm { NH } _ { 4 } \mathrm { Cl } , \mathrm { N } _ { 2 } {/tex}

Explanation

Q 14.

Correct4

Incorrect-1

The shape of {tex} \mathrm { XeO } _ { 2 } \mathrm { F } _ { 2 } {/tex} molecule is

A

trigonal bipyramidal

B

square planar

C

tetrahedral

See-Saw

Explanation

Q 15.

Correct4

Incorrect-1

The product formed in the reaction of {tex} \mathrm { SOCl } _ { 2 } {/tex} with white phosphorous is

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

B

{tex} \mathrm { SO } _ { 2 } \mathrm { Cl } _ { 2 } {/tex}

C

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

D

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

Explanation

Q 16.

Correct4

Incorrect-1

The order of the oxidation state of the phosphorus atom in {tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 2 } , \mathrm { H } _ { 3 } \mathrm { PO } _ { 4 } , \mathrm { H } _ { 3 } \mathrm { PO } _ { 3 } {/tex} and {tex} \mathrm { H } _ { 4 } \mathrm { P } _ { 2 } \mathrm { O } _ { 6 } {/tex} is

A

{tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 3 } > \mathrm { H } _ { 3 } \mathrm { PO } _ { 2 } > \mathrm { H } _ { 3 } \mathrm { PO } _ { 4 } > \mathrm { H } _ { 4 } \mathrm { P } _ { 2 } \mathrm { O } _ { 6 } {/tex}

B

{tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 4 } > \mathrm { H } _ { 3 } \mathrm { PO } _ { 2 } > \mathrm { H } _ { 3 } \mathrm { PO } _ { 3 } > \mathrm { H } _ { 4 } \mathrm { P } _ { 2 } \mathrm { O } _ { 6 } {/tex}

{tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 4 } > \mathrm { H } _ { 4 } \mathrm { P } _ { 2 } \mathrm { O } _ { 6 } > \mathrm { H } _ { 3 } \mathrm { PO } _ { 3 } > \mathrm { H } _ { 3 } \mathrm { PO } _ { 2 } {/tex}

D

{tex} \mathrm { H } _ { 3 } \mathrm { PO } _ { 2 } > \mathrm { H } _ { 3 } \mathrm { PO } _ { 3 } > \mathrm { H } _ { 4 } \mathrm { P } _ { 2 } \mathrm { O } _ { 6 } > \mathrm { H } _ { 3 } \mathrm { PO } _ { 4 } {/tex}

Explanation