NEET > Classification of Elements and Periodicity in Properties

Explore popular questions from Classification of Elements and Periodicity in Properties for NEET. This collection covers Classification of Elements and Periodicity in Properties previous year NEET questions hand picked by popular teachers.


Q 1.    

Correct4

Incorrect-1

The element {tex} Z = 114 {/tex} has been discovered recently. It will belong to which of the following family/group and electronic configuration?

Carbon family, [Rn] 5{tex} f ^ { 14 } .6 d ^ { 10 } 7 s ^ { 2 } 7 p ^ { 2 } {/tex}

B

Oxygen family, [Rn] 5{tex} f ^ { 14 } \ 6 d ^ { 10 } \ 7 s^ { 2 }\ 7 p ^ { 4 } {/tex}

C

Nitrogen family, [Rn] 5{tex} f ^ { 1 4 } 6 d ^ { 10 } 7 s ^ { 2 } 7 p ^ { 6 } {/tex}

D

Halogen family, [Rn] 5{tex} f ^ { \prime 4 } 6 d ^ { 10 } 7 s ^ { 2 } 7 p ^ { 5 } {/tex}

Explanation

Q 2.    

Correct4

Incorrect-1

In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

{tex} \mathrm { I } < \mathrm { Br } < \mathrm { Cl } < \mathrm { F } {/tex} (increasing electron gain enthalpy)

B

{tex} \mathrm {Li} < \mathrm N a < \mathrm K < \mathrm {Rb} {/tex} (increasing metallic radius)

C

{tex} \mathrm { Al } ^ { 3 + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Na } ^ { + } < \mathrm { F } {/tex} (increasing ionic size)

D

None of these

Explanation

Q 3.    

Correct4

Incorrect-1

The species {tex} Ar, K ^ { + }{/tex}and {tex} C a ^ { 2 + } {/tex} contain the same number of electrons. In which order do their radii increase?

{tex} \mathrm { Ca } ^ { 2 + } < \mathrm { K } ^ { + } < \mathrm { Ar } {/tex}

B

{tex} \mathrm { K } ^ { + } < \mathrm { Ar } < \mathrm { Ca } ^ { 2 + } {/tex}

C

{tex} \mathrm { Ar } < \mathrm { K } ^ { + } < \mathrm { Ca } ^ { 2 + } {/tex}

D

{tex} \mathrm { Ca } ^ { 2 + } < \mathrm { Ar } < \mathrm { K } ^ { + } {/tex}

Explanation

Q 4.    

Correct4

Incorrect-1

Which of the following orders of ionic radii is correctly represented?

A

{tex} \mathrm { H^- } > \mathrm { H } ^ { + } > \mathrm { H } {/tex}

B

{tex} \mathrm { Na } ^ { + } > \mathrm { F } > \mathrm { O } ^ { 2 - } {/tex}

C

{tex} \mathrm { F } ^ { - } > \mathrm { O } ^ { 2 - } > \mathrm { Na } ^ { + } {/tex}

None of the above

Explanation

Q 5.    

Correct4

Incorrect-1

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for {tex} \mathrm { C } , \mathrm { Ca } , \mathrm { Al } , \mathrm { F } {/tex} and {tex} \mathrm { O } ? {/tex}

A

{tex} \mathrm{Al} < \mathrm {Ca} < \mathrm O < \mathrm C < \mathrm F {/tex}

B

{tex} \mathrm { Al } < \mathrm { O } < \mathrm { C } < \mathrm { Ca } < \mathrm { F } {/tex}

C

{tex} \mathrm C < \mathrm F < \mathrm O < \mathrm {Al} <\mathrm {Ca} {/tex}

{tex} \mathrm { Ca } < \mathrm { Al } < \mathrm { C } < \mathrm { O } < \mathrm { F } {/tex}

Explanation

Q 6.    

Correct4

Incorrect-1

Identify the wrong statement in the following.

Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius.

B

Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius.

C

Atomic radius of the elements increases as one moves down the first group of the periodic table.

D

Atomic radius of the elements decreases as one moves across from left to right in the {tex} 2 ^ { \text {nd } } {/tex} period of the periodic table.

Explanation

Q 7.    

Correct4

Incorrect-1

What is the value of electron gain enthalpy of {tex} \mathrm { Na } ^ { + } {/tex} if {tex} I E _ { 1 } {/tex} of {tex} \mathrm { Na } = 5.1 \mathrm { eV } ? {/tex}

{tex} - 5.1 \mathrm { eV } {/tex}

B

{tex} - 10.2 \mathrm { eV } {/tex}

C

{tex} + 2.55 \mathrm { eV } {/tex}

D

{tex} + 10.2 \mathrm { eV } {/tex}

Explanation

Q 8.    

Correct4

Incorrect-1

The correct order of the decreasing ionic radii among the following isoelectronic species is

A

{tex} \mathrm { Ca } ^ { 2 + } > \mathrm { K } ^ { + } > \mathrm { S } ^ { 2 - } > \mathrm { CI^- } {/tex}

B

{tex} \mathrm { Cl } ^ { - } > \mathrm { S } ^ { 2 - } > \mathrm { Ca } ^ { 2 + } > \mathrm { K } ^ { + } {/tex}

{tex} \mathrm { S } ^ { 2 - } > \mathrm { Cl } ^ { - } > \mathrm { K } ^ { + } > \mathrm { Ca } ^ { 2 + } {/tex}

D

{tex} \mathrm{K ^ { + }} >\mathrm {C a ^ { 2 + }} > \mathrm {Cl^-} >\mathrm {S ^ { 2 - }} {/tex}

Explanation


Q 9.    

Correct4

Incorrect-1

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements {tex} \mathrm { O } , \mathrm { S } , \mathrm { F } {/tex} and {tex} \mathrm { Cl } {/tex} ?

A

{tex} \mathrm { Cl } < \mathrm { F } < \mathrm { O } < \mathrm { S } {/tex}

{tex} \mathrm { O } < \mathrm { S } < \mathrm { F } < \mathrm { Cl } {/tex}

C

{tex} \mathrm { F } < \mathrm { S } < \mathrm { O } < \mathrm { Cl } {/tex}

D

{tex} \mathrm { S } < \mathrm { O } < \mathrm { Cl } < \mathrm { F } {/tex}

Explanation

Q 10.    

Correct4

Incorrect-1

Among the elements {tex} \mathrm { Ca } , \mathrm { Mg } , \mathrm { P } {/tex} and {tex} \mathrm { Cl } , {/tex} the order of increasing atomic radii is

A

{tex} \mathrm { Mg } < \mathrm { Ca } < \mathrm { Cl } < \mathrm { P } {/tex}

{tex} \mathrm { Cl } < \mathrm { P } < \mathrm { Mg } < \mathrm { Ca } {/tex}

C

{tex} \mathrm { P } < \mathrm { Cl } < \mathrm { Ca } < \mathrm { Mg } {/tex}

D

{tex} \mathrm { Ca } < \mathrm { Mg } < \mathrm { P } < \mathrm { Cl } {/tex}

Explanation

Q 11.    

Correct4

Incorrect-1

Among the following which one has the highest cation to anion size ratio?

A

{tex} \mathrm { CsI } {/tex}

{tex} \mathrm { CsF } {/tex}

C

{tex} \mathrm {LiF}{/tex}

D

{tex} \mathrm { NaF } {/tex}

Explanation

Q 12.    

Correct4

Incorrect-1

Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy?

A

Ne {tex} \left[ 3 s ^ { 2 } 3 p ^ { 2 } \right] {/tex}

B

Ar {tex} \left[ 3 d ^ { 10 } 4 s ^ { 2 } 4 p ^ { 3 } \right] {/tex}

C

Ne {tex} \left[ 3 s ^ { 2 } 3 p ^ { 1 } \right] {/tex}

Ne {tex} \left[ 3 s ^ { 2 } 3 p ^ { 3 } \right] {/tex}

Explanation

Q 13.    

Correct4

Incorrect-1

Which one of the following arrangements does not give the correct picture of the trends indicated against it?

{tex} \mathrm { F } _ { 2 } > \mathrm { Cl } _ { 2 } > \mathrm { Br } _ { 2 } > \mathrm { I } _ { 2 } : {/tex} Bond dissociation energy

B

{tex} \mathrm { F } _ { 2 } > \mathrm { Cl } _ { 2 } > \mathrm { Br } _ { 2 } > \mathrm { I } _ { 2 } : {/tex} Electronegativity

C

{tex} \mathrm { F } _ { 2 } > \mathrm { Cl } _ { 2 } > \mathrm { Br } _ { 2 } > \mathrm { I } _ { 2 } : {/tex} Oxidizing power

D

{tex} \mathrm { F } _ { 2 } > \mathrm { Cl } _ { 2 } > \mathrm { Br } _ { 2 } > \mathrm { I } _ { 2 } : {/tex} Electron gain enthalpy

Explanation


Q 14.    

Correct4

Incorrect-1

Identify the correct order of the size of the following:

{tex} \mathrm { Ca } ^ { 2 + } < \mathrm { K } ^ { + } < \mathrm { Ar } < \mathrm { Cl } ^ { - } < \mathrm { S } ^ { 2 - } {/tex}

B

{tex} \mathrm { Ar } < \mathrm { Ca } ^ { 2 + } < \mathrm { K } ^ { + } < \mathrm { Cl } ^ { - } < \mathrm { S } ^ { 2 - } {/tex}

C

{tex} \mathrm { Ca } ^ { 2 + } < \mathrm { Ar } < \mathrm { K } ^ { + } < \mathrm { Cl } ^ { - } < \mathrm { S } ^ { 2- } {/tex}

D

{tex} \mathrm { Ca } ^ { 2 + } < \mathrm { K } ^ { + } < \mathrm { Ar } < \mathrm { S } ^ { 2 - } < \mathrm { Cl } ^ { - } {/tex}

Explanation

Q 15.    

Correct4

Incorrect-1

With which of the following electronic configuration an atom has the lowest ionisation enthalpy?

A

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

1{tex} s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 5 } 3 s ^ { 1 } {/tex}

C

1{tex} s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } {/tex}

D

1{tex} s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 5 } {/tex}

Explanation

Q 16.    

Correct4

Incorrect-1

Which one of the following ionic species has the greatest proton affinity to form stable compound?

{tex} \mathrm { NH } _ { 2 }^- {/tex}

B

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

C

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

D

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

Explanation

Q 17.    

Correct4

Incorrect-1

Which one of the following orders is not in accordance with the property stated against it?

{tex} \mathrm { F } _ { 2 } > \mathrm { Cl } _ { 2 } > \mathrm { Br } _ { 2 } > \mathrm { I } _ { 2 } : {/tex} Bond dissociation energy

B

{tex} \mathrm { F } _ { 2 } > \mathrm { Cl } _ { 2 }^{-} > { \mathrm { Br } } _ { 2 } > \mathrm { I } _ { 2 } : {/tex} Oxidising power

C

{tex} \mathrm { HI } > \mathrm { HBr } > \mathrm { HCl } > \mathrm { HF } {/tex} : Acidic property in water

D

{tex} \mathrm { F } _ { 2 } > \mathrm { Cl } _ { 2 } > \mathrm { Br } _ { 2 } > \mathrm { I } _ { 2 } : {/tex} Electronegativity

Explanation

Q 18.    

Correct4

Incorrect-1

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

A

{tex} \mathrm { S } < \mathrm { O } < \mathrm { Cl } < \mathrm { F } {/tex}

B

{tex} \mathrm { Cl } < \mathrm { F } < \mathrm { S } < \mathrm { O } {/tex}

C

{tex} \mathrm { F } < \mathrm { Cl } < \mathrm { O } < \mathrm { S } {/tex}

{tex} \mathrm { O } < \mathrm { S } < \mathrm { F } < \mathrm { Cl } {/tex}

Explanation

Q 19.    

Correct4

Incorrect-1

Ionic radii are

inversely proportional to effective nuclear charge

B

inversely proportional to square of effective nuclear charge

C

directly proportional to effective nuclear charge

D

directly proportional to square of effective nuclear charge.

Explanation

Q 20.    

Correct4

Incorrect-1

The ions {tex} \mathrm { O } ^ { 2 - } , \mathrm { F } ^ { - } , \mathrm { Na } ^ { + } , \mathrm { Mg } ^ { 2 + } {/tex} and {tex} \mathrm { Al } ^ { 3 + } {/tex} are isoelectronic. Their ionic radii show

A

a significant increase from {tex} \mathrm { O } ^ { 2 - } {/tex} to {tex} \mathrm { A } \mathrm { l } ^ { 3 + } {/tex}

a significant decrease from {tex} \mathrm { O } ^ { 2 - } {/tex} to {tex} \mathrm { Al } ^ { 3 + } {/tex}

C

an increase from {tex} \mathrm { O } ^ { 2 - } {/tex} to {tex} \mathrm { F } ^ { - } {/tex} and then decrease from {tex} \mathrm { Na } ^ { + } {/tex} to {tex} \mathrm { Al } ^ { 3 + } {/tex}

D

a decrease from {tex} \mathrm { O } ^ { 2 - } {/tex} to {tex} \mathrm { F^- } {/tex} and then increase from {tex} \mathrm { Na } ^ { + } {/tex} to {tex} \mathrm { Al } ^ { 3 + } {/tex} .

Explanation

Q 21.    

Correct4

Incorrect-1

Which statement is wrong?

Bond energy of {tex} \mathrm { F } _ { 2 } > \mathrm { Cl } _ { 2 } {/tex}

B

Electronegativity of {tex} \mathrm { F } > \mathrm { Cl } {/tex}

C

{tex} \mathrm { F } {/tex} is more oxidising than {tex} \mathrm { Cl } {/tex}

D

Electron affinity of {tex} \mathrm { Cl } > \mathrm { F } {/tex}

Explanation

Q 22.    

Correct4

Incorrect-1

Which of the following elements has the maximum electron affinity?

A

{tex} \mathrm I {/tex}

B

{tex} \mathrm {Br} {/tex}

{tex}\mathrm {Cl} {/tex}

D

{tex} \mathrm {F} {/tex}

Explanation

Q 23.    

Correct4

Incorrect-1

The first ionization potentials {tex} ( \mathrm { eV } ) {/tex} of {tex} \mathrm { Be } {/tex} and {tex} \mathrm { B } {/tex} respectively are

A

{tex} 8.29,8.29 {/tex}

B

{tex} 9.32,9.32 {/tex}

C

{tex} 8.29,9.32 {/tex}

{tex} 9.32,8.29 {/tex}

Explanation


Q 24.    

Correct4

Incorrect-1

Which one of the following is correct order of the size of iodine species?

A

{tex} I ^ { + } > I ^ { - } > I {/tex}

{tex} I ^ { - } > I > I ^ { + } {/tex}

C

{tex} I > I^- > I^+ {/tex}

D

{tex} I > I ^ { + } > I^- {/tex}

Explanation

Q 25.    

Correct4

Incorrect-1

Which of the following ion is the largest in size?

A

{tex} \mathrm {K^+} {/tex}

B

{tex} \mathrm { Ca } ^ { 2 + } {/tex}

C

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

{tex} \mathrm { S } ^ { 2- } {/tex}

Explanation