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JEE Mains Previous Years Questions with Solutions

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1

JEE Main 2015 (Offline)

MCQ (Single Correct Answer)
The intermolecular interaction that is dependent on the inverse cube of distance between the molecule is:
A
ion-dipole interaction
B
London force
C
hydrogen bond
D
ion-ion interaction

Explanation

Hydrogen bond is a type of strong electrostatic dipole- dipole intersection and dependent on the inverse cube of distance between the molecular ion-dipole -

interaction $$ \propto {1 \over {{r^3}}}.$$
2

JEE Main 2013 (Offline)

MCQ (Single Correct Answer)
Stability of the species Li2, $$Li_2^−$$ and $$Li_2^+$$ increases in the order of:
A
Li2 < $$Li_2^+$$ < $$Li_2^-$$
B
$$Li_2^+$$ < $$Li_2^-$$ < Li2
C
$$Li_2^-$$ <$$Li_2^+$$ < Li2
D
$$Li_2^-$$ < Li2 < $$Li_2^+$$

Explanation

Li2 = $${\sigma _{1{s^2}}}\,\,\sigma _{1{s^2}}^ * \,$$ $${\sigma _{2{s^2}}} \,$$

$$ \therefore $$ Bond order = $${1 \over 2}\left( {4 - 2} \right)$$ = 1

$$Li_2^+$$ = $${\sigma _{1{s^2}}}\,\,\sigma _{1{s^2}}^ * \,$$ $${\sigma _{2{s^1}}} \,$$

$$ \therefore $$ Bond order = $${1 \over 2}\left( {3 - 2} \right)$$ = 0.5

$$Li_2^-$$ = $${\sigma _{1{s^2}}}\,\,\sigma _{1{s^2}}^ * \,$$ $${\sigma _{2{s^2}}} \,\,\sigma _{1{s^1}}^ * \,$$

$$ \therefore $$ Bond order = $${1 \over 2}\left( {4 - 3} \right)$$ = 0.5

The bond order of $$Li_2^+$$ and $$Li_2^-$$ is same but $$Li_2^+$$ is more stable than $$Li_2^-$$ because $$Li_2^+$$ is smaller in size and has 2 electrons in antibonding orbitals whereas $$Li_2^-$$ has 3 electrons in antibonding orbitals. Hence $$Li_2^+$$ is more stable than $$Li_2^-$$.
3

JEE Main 2013 (Offline)

MCQ (Single Correct Answer)
In which of the following pairs of molecules/ions, both the species are not likely to exist?
A
$$H_2^+$$ , $$He_2^{2-}$$
B
$$H_2^-$$ , $$He_2^{2-}$$
C
$$H_2^{2+}$$ , $$He_2$$
D
$$H_2^-$$ , $$He_2^{2+}$$

Explanation

$$H_2^{2+}$$ , $$He_2$$

Both have zero bond order. Thus, they do not exist.
4

AIEEE 2012

MCQ (Single Correct Answer)
In which of the following pairs the two species are not isostructural ?
A
$$CO_3^{2-}$$ and $$NO_3^-$$
B
$$PCl_4^{+}$$ and $$SiCl_4$$
C
PF5 and BrF5
D
$$AlF_6^-$$ and $$SF_6$$

Explanation

PF5 $$ \Rightarrow $$ sp3d hybridized and shape is trigonal bipyramidal.

BrF5 $$ \Rightarrow $$ 5 bond pair and 1 lone pair present so sp3d2 hybridized and shape is square pyramidal.

Questions Asked from Chemical Bonding & Molecular Structure

On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Indicates No. of Questions
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JEE Main 2021 (Online) 24th February Evening Shift (2)
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JEE Main 2020 (Online) 5th September Evening Slot (1)
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JEE Main 2019 (Online) 12th April Morning Slot (1)
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JEE Main 2019 (Online) 9th April Evening Slot (4)
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JEE Main 2019 (Online) 9th April Morning Slot (1)
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JEE Main 2019 (Online) 8th April Evening Slot (4)
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JEE Main 2019 (Online) 12th January Evening Slot (1)
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JEE Main 2019 (Online) 10th January Evening Slot (2)
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JEE Main 2019 (Online) 10th January Morning Slot (2)
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JEE Main 2019 (Online) 9th January Evening 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 (2)
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JEE Main 2018 (Online) 15th April Evening Slot (2)
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JEE Main 2018 (Offline) (3)
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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 (2)
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JEE Main 2017 (Offline) (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 2015 (Offline) (1)
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JEE Main 2013 (Offline) (2)
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AIEEE 2012 (2)
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AIEEE 2011 (3)
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AIEEE 2009 (1)
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AIEEE 2008 (2)
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AIEEE 2007 (4)
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AIEEE 2006 (3)
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AIEEE 2005 (1)
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AIEEE 2004 (5)
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AIEEE 2003 (4)
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