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JEE Advanced

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

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Some pBlock Elements

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Q 1. Lead pencil contains

A

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

B

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

Graphite

D

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

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Q 2. A gas that cannot be collected over water is

A

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

B

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

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

D

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

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Q 3. Concentrated {tex}\mathrm {HNO} _ { 3 } {/tex} reacts with iodine to give

A

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

B

{tex} \mathrm { HOI } {/tex}

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

D

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

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Q 4. The material used in solar cells contains

A

{tex} \mathrm { Cs } {/tex}

{tex} \mathrm { Si } {/tex}

C

{tex} \mathrm { Sn } {/tex}

D

{tex} \mathrm { Ti } {/tex}

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Q 5. A gas {tex} ' \mathrm { X }' {/tex} is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas {tex} '\mathrm {Y } ' {/tex}. Identify {tex} '\mathrm { X } ' {/tex} and {tex} '\mathrm { Y } ' {/tex}

A

{tex} \mathrm { X } = \mathrm { CO } _ { 2 } , \mathrm { Y } = \mathrm { Cl } _ { 2 } {/tex}

B

{tex} \mathrm { X } = \mathrm { Cl } _ { 2 } , \mathrm { Y } = \mathrm { CO } _ { 2 } {/tex}

{tex} \mathrm { X } = \mathrm { Cl } _ { 2 } , \mathrm { Y } = \mathrm { H } _ { 2 } {/tex}

D

{tex} \mathrm { X } = \mathrm { H } _ { 2 } , \mathrm { Y } = \mathrm { Cl } _ { 2 } {/tex}

Explanation

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Q 6. Which of the following isomers of phosphorus are thermodynamically least and most stable?

A

White (least), Red (most)

B

Yellow (least), Red (most)

C

Red (least), White (most)

White (least), Black (most)

Explanation


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Q 7. 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

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Q 8. The reaction of white phosphorus with aqueous {tex}\mathrm {NaOH}{/tex} gives phosphine along with another phosphorus containing compound. The reaction type, the oxidation states of phosphorus in phosphine and the other product, respectively, are

A

redox reaction, {tex} - 3 {/tex} and {tex} - 5 {/tex}

B

redox reaction, {tex} 3 {/tex} and {tex} + 5 {/tex}

disproportionation reaction, {tex} - 3 {/tex} and {tex} + 5 {/tex}

D

disproportionation reaction, {tex} - 3 {/tex} and {tex} + 3 {/tex}

Explanation

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Q 9. The element with the highest first ionization potential is

A

boron

B

carbon

nitrogen

D

oxygen

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Q 10. Moderate electrical conductivity is shown by

A

silica

graphite

C

diamond

D

carborundum

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Q 11. Chlorine acts as a bleaching agent only in presence of

A

dry air

moisture

C

sunlight

D

pure oxygen

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Q 12. Bromine can be liberated from potassium bromide solution by action of

A

iodine solution

chlorine solution

C

sodium chloride

D

potassium iodide

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Q 13.

Which of the following is arranged in the increasing order of enthalpy of vaporization?

A

B

C

Explanation

Most least

volatile volatile due to

H-bonding

Electrons

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Q 14.

The number of bonds in cyclic metaphosphoric acid is

A

Zero

B

Two

Three

D

Four

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Q 15.

Phosphorus trichloride, undergoes hydrolysis to produce an oxoacid. It has the formula

A

C

D

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Q 16.

Principal cause of ozone depletion is the

Presence of fluorocarbons

B

Acid rain

C

Photochemical smog

D

Green-house effect

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Q 17.

Following are neutral oxides except

A

NO

B

C

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Q 18.

Thermodynamically most stable form of carbon is

Graphite

B

Diamond

C

Ionsdaleite

D

Chaoite

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Q 19.

In making casting of metal, silicon is used as

A

Oxidizer

B

Semiconductor

Deoxidizer

D

None of these

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Q 20.

Reactivity of borazole is greater than that of benzene because

A

Borazole is polar compound

B

Borazole is non-polar compound

C

Borazole is electron deficient compound

Of localized electros in it

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Q 21.

Cold solution of barium nitrite on mixing with sulphuric acid produces

B

C

D

Explanation

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Q 22.

Borax is used

A

As a flux in brazing and in silver soldering

B

In making enamel

C

In leather tanning

In all given above

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Q 23.

Which is the incorrect statement about silicones?

They are repeating units in silicates

B

They are synthetic polymers containing repeated units

C

They are formed by hydrolysis of

D

All the above are incorrect statements

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Q 24.

can be used as

Reducing agent

B

Oxidizing agent

C

Catalyst in Friedel Crafts reaction

D

A base

Explanation

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Q 25.

In aqueous solution disproportionates to

A

and

and

C

and

D

and

Explanation

by by

reduction oxidation