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JEE Mains Previous Years Questions with Solutions

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1

AIEEE 2010

MCQ (Single Correct Answer)
If 10–4 dm3 of water is introduced into a 1.0 dm3 flask to 300 K, how many moles of water are in the vapour phase when equilibrium is established ?
(Given : Vapour pressure of H2O at 300 K is 3170 Pa ; R = 8.314 J K–1 mol–1)
A
5.56 x 10–3 mol
B
1.53 x 10–2 mol
C
4.46 x 10–2 mol
D
1.27 x 10–3 mol

Explanation

From the ideal gas equation :

$$PV = nRT\,\,$$

or $$\,\,\,n = {{PV} \over {RT}} = {{3170 \times {{10}^{ - 3}}} \over {8.314 \times 300}}$$

$$ = 1.27 \times {10^{ - 3}}$$
2

AIEEE 2007

MCQ (Single Correct Answer)
Equal masses of methane and oxygen are mixed in an empty container at 25oC. The fraction of the total pressure exerted by oxygen is
A
2/3
B
1/2
C
1/3 $$\times$$ 273/298
D
1/3

Explanation

Let the mass of methane and oxygen $$=m$$ $$gm.$$

Mole fraction of $${O_2}$$

$$ = {{Moles\,\,of\,\,{O_2}} \over {Moles\,\,of\,\,{O_2}\, + \,Moles\,\,of\,\,C{H_4}}}$$

$$ = {{m/32} \over {m/32 + m/16}}$$

$$ = {{m/32} \over {3m/32}} = {1 \over 3}$$

Partial pressure of $${O_2}$$

$$=$$ Total pressure $$ \times $$ mole fraction of $${O_2},$$

$${P_{{O_2}}} = P \times {1 \over 3} = {1 \over 3}P$$
3

AIEEE 2005

MCQ (Single Correct Answer)
Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?
A
The most probable speed increases
B
The fraction of the molecules with the most probable speed increases
C
The distribution becomes broader
D
The area under the distribution curve remains the same as under the lower temperature

Explanation

Distribution of molecular velocities at two different temperature is given shown below.



NOTE : At higher temperature more molecules have higher velocities and less molecules have lower velocities.

As evident from fig. thus it is clear that With the increase in temperature the most probable velocity increase but the fraction of such molecules decreases.
4

AIEEE 2004

MCQ (Single Correct Answer)
In Van der Waals equation of state of the gas law, the constant ‘b’ is a measure of
A
intermolecular repulsions
B
intermolecular collisions per unit volume
C
Volume occupied by the molecules
D
intermolecular attraction

Explanation

In van der Waals equation $$'b'$$ is for volume correction.

Questions Asked from Gaseous State

On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Indicates No. of Questions
JEE Main 2021 (Online) 31st August Morning Shift (1)
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JEE Main 2021 (Online) 27th August Morning Shift (1)
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JEE Main 2021 (Online) 26th August Evening Shift (1)
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JEE Main 2020 (Online) 3rd September Evening Slot (1)
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JEE Main 2020 (Online) 2nd September Morning Slot (1)
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JEE Main 2019 (Online) 10th April Evening Slot (1)
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JEE Main 2019 (Online) 10th April Morning Slot (1)
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JEE Main 2019 (Online) 9th April Evening Slot (1)
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JEE Main 2019 (Online) 9th April Morning Slot (1)
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JEE Main 2019 (Online) 12th January Evening Slot (1)
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JEE Main 2019 (Online) 12th January Morning Slot (1)
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JEE Main 2019 (Online) 9th January Morning Slot (1)
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JEE Main 2018 (Online) 16th April Morning Slot (1)
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JEE Main 2017 (Online) 9th April Morning Slot (1)
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JEE Main 2017 (Online) 8th April Morning Slot (1)
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JEE Main 2016 (Online) 10th April Morning Slot (1)
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JEE Main 2016 (Online) 9th April Morning Slot (1)
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JEE Main 2016 (Offline) (1)
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JEE Main 2014 (Offline) (1)
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JEE Main 2013 (Offline) (1)
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AIEEE 2012 (1)
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AIEEE 2011 (1)
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AIEEE 2010 (1)
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AIEEE 2007 (1)
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AIEEE 2005 (1)
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AIEEE 2004 (2)
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AIEEE 2003 (1)
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AIEEE 2002 (3)
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