JEE Main > Hydrogen

Explore popular questions from Hydrogen for JEE Main. This collection covers Hydrogen previous year JEE Main questions hand picked by popular teachers.

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				Q 1.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Water gas is a mixture of					

				

				
	
										

						

							
							
A

							
{tex} \mathrm { CO } {/tex} and {tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex}

						

					

										

						

							
							
B

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

						

					

										

						

							
							
C

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

						

					

										

						

							
							

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

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 2.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						An orange coloured solution of {tex} \mathrm { K } _ { 2 } \mathrm { Cr } _ { 2 } \mathrm { O } _ { 7 } {/tex} acidified with {tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex} and treated with a substance {tex} \mathrm { X } {/tex} gives a blue coloured solution of {tex} \mathrm { CrO } _ { 5 } . {/tex} The substance {tex} \mathrm { X } {/tex} is					

				

				
	
										

						

							
							
A

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

						

					

										

						

							
							
B

							
{tex}\mathrm {dil. \ HCl}{/tex}

						

					

										

						

							
							

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

						

					

										

						

							
							
D

							
{tex}\mathrm{conc. HCl}{/tex}

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 3.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						The number of H-bonds formed by a water molecule is					

				

				
	
										

						

							
							
A

							
2

						

					

										

						

							
							
B

							
8

						

					

										

						

							
							
C

							
1

						

					

										

						

							
							

							
4

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 4.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						When {tex}\mathrm{1\ mole}{/tex} of {tex}\mathrm{PbS}{/tex} reacts completely with {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex}					

				

				
	
										

						

							
							
A

							
{tex} \mathrm { H } _ { 2 } {/tex} is liberated

						

					

										

						

							
							
B

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

						

					

										

						

							
							

							
{tex}\mathrm{4 \ moles}{/tex} of {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} consumed

						

					

										

						

							
							
D

							
Sulphur is converted to sulphite

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 5.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						The term hydride gap refers to which region of periodic table?					

				

				
	
										

						

							
							
A

							
Groups 6 to 9

						

					

										

						

							
							

							
Groups 7 to 9

						

					

										

						

							
							
C

							
Groups 7 to 10

						

					

										

						

							
							
D

							
Groups 5 to 7

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 6.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Which one is true about nascent hydrogen?					

				

				
	
										

						

							
							
A

							
More reactive than molecular hydrogen

						

					

										

						

							
							
B

							
Can be produced in situ 

						

					

										

						

							
							
C

							
Show similarity exactly with hydrogen in reduction reactions

						

					

										

						

							
							

							
Both ( 1 ) & ( 2 )

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 7.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						2-ethyl anthraquinol when oxidised in air produces					

				

				
	
										

						

							
							
A

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

						

					

										

						

							
							

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

						

					

										

						

							
							
C

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

						

					

										

						

							
							
D

							
{tex} \mathrm { C} _ { 2 } \mathrm { H } _ { 5 } \mathrm { OH } {/tex}

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 8.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Which are the compounds, which can be oxidised and reduced by {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} in acidic and basic medium respectively?					

				

				
	
										

						

							
							
A

							
{tex} \left[ \mathrm { K } _ { 2 } \mathrm { O } , \mathrm { NaAlO } _ { 2 } \right] {/tex}

						

					

										

						

							
							
B

							
{tex} \left[ \mathrm { KMnO } _ { 4 } , \mathrm { K } _ { 2 } \mathrm { MnO } _ { 4 } \right] {/tex}

						

					

										

						

							
							

							
{tex} \left\{ \mathrm { K } _ { 4 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] , \mathrm { K } _ { 3 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] \right\} {/tex}

						

					

										

						

							
							
D

							
{tex} \left[ \mathrm { K } _ { 3 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } , \mathrm { K } _ { 4 } \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right]] \right. {/tex}

						

					

										
					


					

						
Explanation

						

						


						

					



				

			

		

	





		

			

				Q 9.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						In alkaline medium, which elements can produce hydrogen?					

				

				
	
										

						

							
							

							
{tex} \mathrm { Zn } , \mathrm { Si } {/tex}

						

					

										

						

							
							
B

							
{tex} \mathrm { Cu } , \mathrm { Ag } {/tex}

						

					

										

						

							
							
C

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

						

					

										

						

							
							
D

							
{tex}\mathrm {Al}{/tex}, {tex} \mathrm { C } {/tex}

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 10.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Select the incorrect statement					

				

				
	
										

						

							
							
A

							
Ortho and para hydrogen are different due to difference in their nuclear spins

						

					

										

						

							
							

							
Ortho and para hydrogen are different due to difference in their electron spins

						

					

										

						

							
							
C

							
Para hydrogen has a lower internal energy than that of ortho hydrogen

						

					

										

						

							
							
D

							
Parahydrogen is more stable at lower temperature

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 11.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Hydride ion is a					

				

				
	
										

						

							
							
A

							
Strong conjugate acid of {tex} \mathrm { H } _ { 2 } {/tex}

						

					

										

						

							
							

							
Strong conjugate base of {tex} \mathrm { H } _ { 2 } {/tex}

						

					

										

						

							
							
C

							
Strong conjugate acid of {tex}\mathrm{H^+}{/tex}

						

					

										

						

							
							
D

							
Strong conjugate base of {tex}\mathrm{H^-}{/tex}

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 12.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						lonic hydrides react with water to					

				

				
	
										

						

							
							
A

							
Give acidic solutions

						

					

										

						

							
							

							
Give basic solutions

						

					

										

						

							
							
C

							
Produce hydride ions

						

					

										

						

							
							
D

							
Produce protons

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 13.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						The boiling point of water is exceptionally high due to					

				

				
	
										

						

							
							
A

							
Covalent bond between {tex} \mathrm { H } {/tex} and {tex} \mathrm { O } {/tex}

						

					

										

						

							
							
B

							
Linear shape

						

					

										

						

							
							

							
Hydrogen bonding

						

					

										

						

							
							
D

							
Non-linear shape

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 14.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Metallic hydrides					

				

				
	
										

						

							
							
A

							
Are also called interstitial hydrides

						

					

										

						

							
							
B

							
Are non-stoichiometric, being deficient in hydrogen

						

					

										

						

							
							
C

							
{tex}\mathrm {Pt} {/tex} and {tex}\mathrm {Pd}{/tex} hydrides are the example of it

						

					

										

						

							
							

							
Have all properties given above

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 15.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						The volume strength of {tex} 3.57 \mathrm { M } {/tex} solution of hydrogen peroxide is					

				

				
	
										

						

							
							
A

							
{tex}30{/tex} volume

						

					

										

						

							
							

							
{tex}40{/tex}  volume

						

					

										

						

							
							
C

							
{tex}20{/tex}  volume

						

					

										

						

							
							
D

							
{tex}25{/tex} volume

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 16.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						In the following reaction using isotopic {tex} ^ { 18 } \mathrm { O } {/tex} in {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 }, {/tex}
{tex} 2 \mathrm { MnO } _ { 4 } ^ { - } + 3 \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } ^ { 18 } \rightarrow 2 \mathrm { MnO } _ { 2 } + 3 \mathrm { O } _ { 2 } + 2 \mathrm { H } _ { 2 } \mathrm { O } + 2 \mathrm { OH } ^ { - } {/tex} isotopic oxygen goes
					

				

				
	
										

						

							
							

							
Both with  {tex} \mathrm O_ { 2 } {/tex}

						

					

										

						

							
							
B

							
Both with  {tex}\mathrm {MnO} _ { 2 } {/tex}

						

					

										

						

							
							
C

							
Both with {tex}\mathrm {OH}^{-}{/tex}

						

					

										

						

							
							
D

							
One with {tex} \mathrm { O } _ { 2 } {/tex} and one with {tex} \mathrm { MnO } _ { 2 } {/tex}

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 17.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						{tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} can be obtained when following reacts with {tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex} except with					

				

				
	
										

						

							
							

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

						

					

										

						

							
							
B

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

						

					

										

						

							
							
C

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

						

					

										

						

							
							
D

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

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 18.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						{tex}10{/tex} volumes of {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} means					

				

				
	
										

						

							
							

							
{tex} 1 \mathrm { \ ml }\ \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} solution gives {tex} 10 \mathrm { ml } \ \mathrm { O } _ { 2 } {/tex} at {tex}\mathrm {NTP}{/tex}

						

					

										

						

							
							
B

							
{tex} 1 \mathrm { \ gm } \ \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} solution gives {tex} 10 \mathrm { \ ml } \ \mathrm { O } _ { 2 } {/tex} at {tex}\mathrm{NTP}{/tex}

						

					

										

						

							
							
C

							
{tex} 1 \mathrm {\  mol } \ \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} solution gives {tex} 10 \mathrm {\  ml } \ \mathrm { O } _ { 2 } {/tex} at {tex} \mathrm { NTP } {/tex}

						

					

										

						

							
							
D

							
{tex} 1 \mathrm { \ ml }\  \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} solution gives {tex} 100 \mathrm { \ ml } \ \mathrm { O } _ { 2 } {/tex} at {tex} \mathrm { NTP } {/tex}

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 19.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Out of {tex}\mathrm {LiH}{/tex},  {tex}\mathrm {MgH}  _ { 2 } {/tex} and {tex}\mathrm {CuH}{/tex}					

				

				
	
										

						

							
							
A

							
All are ionic hydrides

						

					

										

						

							
							
B

							
{tex}\mathrm {LiH, MgH_2,} {/tex}are ionic and {tex}\mathrm {CuH}{/tex} is covalent hydride

						

					

										

						

							
							
C

							
All are covalent hydrides

						

					

										

						

							
							

							
{tex}\mathrm {LiH} {/tex} and  {tex} \mathrm {MgH}_ { 2 } {/tex} are ionic hydride and {tex}\mathrm {CuH}{/tex} is intermediate hydride

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 20.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Consider the following reactions
{tex} \mathrm { I. } {/tex} {tex} \mathrm { AlH } _ { 3}  + \mathrm { H } ^ { - } \rightarrow\mathrm {AlH } _4^ { - } {/tex}
{tex}  {/tex}  {tex}\mathrm { II. }  \mathrm { H } _ { 2 } \mathrm { O } + \mathrm { H } ^ { - } \rightarrow \mathrm { H } _ { 2 } + \mathrm { OH } ^ { - } {/tex}
 Select the correct statements based on these reactions. 					

				

				
	
										

						

							
							
A

							
{tex} \mathrm { H } ^ { - } {/tex} is a Lewis acid in  I  and Lewis base in II

						

					

										

						

							
							

							
{tex} \mathrm { H }^{-} {/tex} is a Lewis base in 1 and Bronsted base in II

						

					

										

						

							
							
C

							
{tex} \mathrm { H } ^ { - } {/tex} is a Lewis acid in   I  and Bronsted acid in II

						

					

										

						

							
							
D

							
{tex} \mathrm { H } ^ { - } {/tex} is a Lewis base in I and II

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 21.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Which among the following is interstitial hydride?					

				

				
	
										

						

							
							
A

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

						

					

										

						

							
							
B

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

						

					

										

						

							
							
C

							
{tex} \mathrm { TiH } _ { 1.7 } {/tex}

						

					

										

						

							
							

							
All of these

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 22.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Heavy water is					

				

				
	
										

						

							
							
A

							
{tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex} with dissolved {tex} \mathrm { Mg } \left( \mathrm { HCO } _ { 3 } \right) _ { 2 } {/tex}

						

					

										

						

							
							

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

						

					

										

						

							
							
C

							
{tex} \mathrm { D } _ { 2 } \mathrm { O } {/tex} with heavy metal impurities

						

					

										

						

							
							
D

							
{tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex} with {tex} \mathrm { CaCO } _ { 3 } {/tex}

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 23.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Dipole moment of {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} is non-zero as					

				

				
	
										

						

							
							
A

							
Two dipole moments are opposite but unequal

						

					

										

						

							
							
B

							
Two dipole moments are opposite and equal

						

					

										

						

							
							
C

							
Two dipole moments are equal but not at {tex} 180 ^ { \circ } {/tex}

						

					

										

						

							
							

							
Two dipole moments are equal but non-planar

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 24.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Neutrality of water is due to					

				

				
	
										

						

							
							
A

							
{tex} \mathrm { pH } = 7 {/tex}

						

					

										

						

							
							
B

							
Presence of salts

						

					

										

						

							
							

							
{tex}  \left[\mathrm H ^ { + } \right] = \left[ \mathrm{O H} ^ { - } \right] {/tex}

						

					

										

						

							
							
D

							
Amphoteric nature

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	





		

			

				Q 25.   
				   
				
Correct4

				
Incorrect-1

			

			
		

		

			
			

				

					

						Which of the following cation is stable in water?					

				

				
	
										

						

							
							
A

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

						

					

										

						

							
							
B

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

						

					

										

						

							
							
C

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

						

					

										

						

							
							

							
All of these

						

					

										
					


					

						
Explanation

						

						

						

					



				

			

		

	













 






	

		

			

			

















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