JEE Main > Classification of Elements and Periodicity in Properties

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				Q 1.   
				   
				
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						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

				
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						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

				
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						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

				
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						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

				
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						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

				
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						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

				
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						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

				
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						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

				
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						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

				
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						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

				
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						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

				
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						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

				
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						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

				
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						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

						

						


						

					



				

			

		

	













 






	

		

			

			

















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