JEE Main > Classification of Elements and Periodicity in Properties

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Q 1.    

Correct4

Incorrect-1

According to the Periodic Law of elements, the variation in properties of elements is related to their

A

nuclear masses

atomic numbers

C

nuclear neutron-proton number ratios

D

atomic masses

Explanation

Q 2.    

Correct4

Incorrect-1

According to the Periodic Law of elements, the variation in properties of elements is related to their

A

nuclear masses

atomic numbers

C

nuclear neutron-proton number ratios

D

atomic masses

Explanation

Q 3.    

Correct4

Incorrect-1

Which one of the following is an amphoteric oxide?

A

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

B

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

C

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

{tex} \mathrm { ZnO } {/tex}

Explanation

Q 4.    

Correct4

Incorrect-1

Which one of the following ions has the highest value of ionic radius?

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

B

{tex} \mathbf { B } ^ { 3 + } {/tex}

C

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

D

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

Explanation









Q 5.    

Correct4

Incorrect-1

Among {tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } , \mathrm { SiO } _ { 2 } , \mathrm { P } _ { 2 } \mathrm { O } _ { 3 } {/tex} and {tex} \mathrm { SO } _ { 2 } {/tex} the correct order of acid strength is

A

{tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } < \mathrm { SiO } _ { 2 } < \mathrm { SO } _ { 2 } < \mathrm { P } _ { 2 } \mathrm { O } _ { 3 } {/tex}

B

{tex} \mathrm { SiO } _ { 2 } < \mathrm { SO } _ { 2 } < \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } < \mathrm { P } _ { 2 } \mathrm { O } _ { 3 } {/tex}

C

{tex} \mathrm { SO } _ { 2 } < \mathrm { P } _ { 2 } \mathrm { O } _ { 3 } < \mathrm { SiO } _ { 2 } < \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } {/tex}

{tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } < \mathrm { SiO } _ { 2 } < \mathrm { P } _ { 2 } \mathrm { O } _ { 3 } < \mathrm { SO } _ { 2 } {/tex}

Explanation

Q 6.    

Correct4

Incorrect-1

The formation of the oxide ion {tex} \mathrm { O } _ { ( \mathrm { g } ) } ^ { 2 - } {/tex} requires first an exothermic and then an endothermic step as shown below
{tex} \mathrm { O } _ { ( \mathrm { g } ) } + \mathrm { e } ^ { - } = \mathrm { O } _ { ( \mathrm { g } ) } ^ { - } \Delta \mathrm { H } ^ { \circ } = - 142 \mathrm { k } \mathrm { Jmol } ^ { - 1 } {/tex}
{tex} \mathrm { O } ^ { - } ( \mathrm { g } ) + \mathrm { e } ^ { - } = \mathrm { O } _ { ( \mathrm { g } ) } ^ { 2 - } \Delta \mathrm { H } ^ { \circ } = 844 \mathrm { kJmol } ^ { - 1 } {/tex}
This is because

{tex}O^- {/tex}ion will tend to resist the addition of another electron

B

Oxygen has high electron affinity

C

Oxygen is more elecronegative

D

{tex} \mathrm { O } ^ { - } {/tex} ion has comparatively larger size than oxygen atom

Explanation

Q 7.    

Correct4

Incorrect-1

Which of the following oxides is amphoteric in character?

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

B

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

C

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

D

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

Explanation







Q 8.    

Correct4

Incorrect-1

In which of the following arrangements, the order is NOT according to the property indicated against it?

A

{tex} Li < N a < K < R b {/tex} : Increasing metallic radius

B

{tex}I < \mathrm { Br } < \mathrm { F } < \mathrm { Cl } {/tex} : Increasing electron gain enthalpy (with negative sign)

{tex} \mathrm { B } < \mathrm { C } < \mathrm { N } < \mathrm { O } {/tex} Increasing first ionization enthalpy

D

{tex} \mathrm { Al } ^ { 3 + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Na } ^ { + } < \mathrm { F } ^ { - } {/tex} Increasing ionic size

Explanation




Q 9.    

Correct4

Incorrect-1

Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?

A

Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens

In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

C

The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group

D

In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group

Explanation

Q 10.    

Correct4

Incorrect-1

In which of the following arrangements, the sequence is not strictly according to the property written against it?

A

{tex} \mathrm { HF } < \mathrm { HCl } < \mathrm { HBr } , \mathrm { HI } : \quad {/tex} increasing acid strength

{tex} \mathrm { NH } _ { 3 } < \mathrm { PH } _ { 3 } < \mathrm { AsH } _ { 3 } < \mathrm { SbH } _ { 3 } : {/tex} increasing basic strength

C

{tex} \mathrm { B } < \mathrm { C } < \mathrm { O } < \mathrm { N } : {/tex} increasing first ionization enthalpy

D

{tex} \mathrm { CO } _ { 2 } < \mathrm { SiO } _ { 2 } < \mathrm { SnO } _ { 2 } < \mathrm { PbO } _ { 2 } : {/tex} increasing oxidising power

Explanation



Q 11.    

Correct4

Incorrect-1

The correct sequence which shows decreasing order of the ionic radii of the elements is

A

{tex} \mathrm { Al } ^ { 3 + } > \mathrm { Mg } ^ { 2 + } > \mathrm { Na } ^ { + } > \mathrm { F } ^ { - } > \mathrm { O } ^ { 2 - } {/tex}

B

{tex} \mathrm { Na } ^ { + } > \mathrm { Mg } ^ { 2 + } > \mathrm { Al } ^ { 3 + } > \mathrm { O } ^ { 2 - } > \mathrm { F } ^ { - } {/tex}

C

{tex} \mathrm { Na } ^ { + } > \mathrm { F } ^ { - } > \mathrm { Mg } ^ { 2 + } > \mathrm { O } ^ { 2 - } > \mathrm { Al } ^ { 3 + } {/tex}

{tex} \mathrm { O } ^ { 2 - } > \mathrm { F } ^ { - } > \mathrm { Na } ^ { + } > \mathrm { Mg } ^ { 2 + } > \mathrm { Al } ^ { 3 + } {/tex}

Explanation



Q 12.    

Correct4

Incorrect-1

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

{tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } < \mathrm { MgO } < \mathrm { Na } _ { 2 } \mathrm { O } < \mathrm { K } _ { 2 } \mathrm { O } {/tex}

B

{tex} \mathrm { MgO } < \mathrm { K } _ { 2 } \mathrm { O } < \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } < \mathrm { Na } _ { 2 } \mathrm { O } {/tex}

C

{tex} \mathrm { Na } _ { 2 } \mathrm { O } < \mathrm { K } _ { 2 } \mathrm { O } < \mathrm { MgO } < \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } {/tex}

D

{tex} \mathrm { K } _ { 2 } \mathrm { O } < \mathrm { Na } _ { 2 } \mathrm { O } < \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } < \mathrm { MgO } {/tex}

Explanation


Q 13.    

Correct4

Incorrect-1

The increasing order of the ionic radii of the given isoelectronic species is:

A

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

B

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

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

D

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

Explanation





Q 14.    

Correct4

Incorrect-1

Which of the following represents the correct order of increasing first ionization enthalpy for {tex} \mathrm { Ca } , \mathrm { Ba } , \mathrm { S } , \mathrm { Se } {/tex} and {tex} \mathrm { Ar } {/tex} ?

A

{tex} \mathrm { Ca } < \mathrm { S } < \mathrm { Ba } < \mathrm { Se } < \mathrm { Ar } {/tex}

B

{tex} \mathrm { S } < \mathrm { Se } < \mathrm { Ca } < \mathrm { Ba } < \mathrm { Ar } {/tex}

{tex} \mathrm { Ba } < \mathrm { Ca } < \mathrm { Se } < \mathrm { S } < \mathrm { Ar } {/tex}

D

{tex} \mathrm { Ca } < \mathrm { Ba } < \mathrm { S } < \mathrm { Se } < \mathrm { Ar } {/tex}

Explanation



Q 15.    

Correct4

Incorrect-1

The first ionisation potential of Na is {tex}5.1{/tex} eV. The value of electron gain enthalpy of {tex} \mathrm { Na } ^ { + } {/tex} will be:

A

{tex} - 2.55 {/tex} eV

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

C

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

D

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

Explanation





Q 16.    

Correct4

Incorrect-1

The ionic radii (in {tex}\overset{\circ}{\mathrm A}) {/tex} of {tex} \mathrm { N } ^ { 3- } , \mathrm { O } ^ { 2 - } {/tex} and {tex} \mathrm { F } ^- \,\,{/tex} are respectively:

{tex} 1.71,1.40 {/tex} and {tex} 1.36{/tex}

B

{tex} 1.71,1.36 {/tex} and {tex}1.40{/tex}

C

{tex} 1.36,1.40 {/tex} and {tex}1.71{/tex}

D

{tex} 1.36,1.71 {/tex} and {tex}1.40{/tex}

Explanation



Q 17.    

Correct4

Incorrect-1

Which is the correct order of atomic sizes?
(At. Nos.: {tex} \mathrm { Ce } = 58 , \mathrm { Sn } = 50 , \mathrm { Yb } = 70 \text { and } \mathrm { Lu } = 71 ) {/tex}

{tex} \mathrm { Ce } > \mathrm { Sn } > \mathrm { Yb } > \mathrm { Lu } {/tex}

B

{tex} \mathrm { Sn } > \mathrm { Ce } > \mathrm { Lu } > \mathrm { Yb } {/tex}

C

{tex} \mathrm { Lu } > \mathrm { Yb } > \mathrm { Sn } > \mathrm { Ce } {/tex}

D

{tex} \mathrm { Sn } > \mathrm { Yb } > \mathrm { Ce } > \mathrm { Lu } {/tex}

Explanation


Q 18.    

Correct4

Incorrect-1

According to the periodic law of elements, the variation in properties of elements is related to their

A

atomic masses

B

nuclear masses

atomic numbers

D

nuclear neutron-proton number ratios.

Explanation


Q 19.    

Correct4

Incorrect-1

Which one of the following groupings represents a collection of isoelectronic species?
(At. {tex} \operatorname { nos } \ldots ( \mathrm { s } - 55 , \mathrm { Br } - 35 ) {/tex}

A

{tex} \mathrm { Na } ^ { + } , \mathrm { Ca } ^ { 2 + } , \mathrm { Mg } ^ { 2 + } {/tex}

{tex} \mathrm { N } ^ { 3 - } , \mathrm { F } ^ { - } , \mathrm { Na } ^ { + } {/tex}

C

{tex} \mathrm { Be } , \mathrm { Al } ^ { 3 + } , \mathrm { Cl } ^ { - } {/tex}

D

{tex} \mathrm { Ca } ^ { 2 + } , \mathrm { Cs } ^ { + } , \mathrm { Br } {/tex}

Explanation


Q 20.    

Correct4

Incorrect-1

Which one of the following ions has the highest value of ionic radius?

A

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

B

{tex} B ^ { 3 + } {/tex}

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

D

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

Explanation



Q 21.    

Correct4

Incorrect-1

Which one of the following sets of ions represents the collection of isoelectronic species?
(Atomic nos.: {tex} \mathrm { F } = 9 , \mathrm { Cl } = 17 , \mathrm { Na } = 11 , \mathrm { Mg } = 12 , {/tex} {tex} \mathrm { Al } = 13 , \mathrm { K } = 19 , \mathrm { Ca } = 20 , \mathrm { Sc } = 21 {/tex})

{tex} \mathrm { K } ^ { + } , \mathrm { Ca } ^ { 2 + } , \mathrm { Sc } ^ { 3 + } , \mathrm { Cl } ^ { - } {/tex}

B

{tex} \mathrm { Na } ^ { + } , \mathrm { Ca } ^ { 2 + } , \mathrm { Sc } ^ { 3 + } , \mathrm { F } ^ { - } {/tex}

C

{tex} \mathrm { K } ^ { + } , \mathrm { Cl } ^ { - } , \mathrm { Mg } ^ { 2 + } , \mathrm { Sc } ^ { 3 + } {/tex}

D

{tex} \mathrm { Na } ^ { + } , \mathrm { Mg } ^ { 2 + } , \mathrm { Al } ^ { 3 + } , \mathrm { Cl } ^ { - } {/tex}

Explanation


Q 22.    

Correct4

Incorrect-1

The formation of the oxide ion {tex} \mathrm { O } ^ { 2 - } {/tex} {tex}_(g){/tex} requires first an exothermic and then an endothermic step as shown below.
{tex} \mathrm { O } _ { ( g ) } + e ^ { - } = \mathrm { O } ^ { - } _ { ( g ) } ; \Delta H ^ { \circ } = - 142 \mathrm { kJmol } ^ { - 1 } {/tex}
{tex} \mathrm { O } ^ { - } _ { ( g ) } + e ^ { - } = \mathrm { O } ^ { 2 - } _ { ( \mathrm { g } ) } ; \Delta H ^ { \circ } = 844 \mathrm { kJmol } ^ { - 1 } {/tex}
This is because

Oxygen is more electronegative

B

oxygen has high electron affinity

C

{tex}O^-{/tex}ion will tend to resist the addition of another electron

D

{tex}O^-{/tex} ion has comparatively larger size than oxygen atom.

Explanation


Q 23.    

Correct4

Incorrect-1

Which among the following factors is the most importantin making fluorine the strongest oxidising agent?

A

Electron affinity

B

Ionization energy

C

Hydration enthalpy

Bond dissociation energy.

Explanation


Q 24.    

Correct4

Incorrect-1

Lattice energy of an ionic compound depends upon

A

charge on the ion only

B

size of the ion only

C

packing of the ion only

charge and size of the ion.

Explanation


Q 25.    

Correct4

Incorrect-1

Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point?

A

{tex} \mathrm { LiCl } {/tex}

{tex} \mathrm { NaCl } {/tex}

C

{tex} \mathrm { KCl } {/tex}

D

{tex} \mathrm { RbCl } {/tex}

Explanation