JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

The number of lone pair of electrons on the central I atom in \( \mathrm{I_3^-} \) is ________.

In the following molecule,

Hybridisation of carbon \( a \), \( b \) and \( c \) respectively are:

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Lithium halides are some what covalent in nature
Reason R: Lithium possess high polarisation capability
In the light of the above statements, choose the most appropriate answer from the options given below:

According to molecular orbital theory, the number of unpaired electron(s) \( \mathrm{O}_2^{2-} \) is _______.

The number of species below that have two lone pairs of electrons in their central atom is_____ \( \mathrm{SF_4} \), \( \mathrm{BF_4^-} \), \( \mathrm{ClF_3} \), \( \mathrm{AsF_3} \), \( \mathrm{PCl_5} \), \( \mathrm{BrF_5} \), \( \mathrm{XeF_4} \), \( \mathrm{SF_6} \)

The number of sigma bonds in is _______________ .

The difference between bonds order of \( \mathrm{CO} \) and \( \mathrm{NO^+} \) is \( \dfrac{x}{2} \) where \( x = \) ______. (Round off to the Nearest Integer)

AX is a covalent diatomic molecule where A and X are second row elements of periodic table. Based on Molecular orbital theory, the bond order of AX is \( 2.5 \). The total number of electrons in AX is __________. (Round off to the Nearest Integer).

The bond order and magnetic behaviour of \( \mathrm{O_2^-} \) ion are, respectively:

Number of \( \mathrm{Cl} = \mathrm{O} \) bonds in chlorous acid, chloric acid and perchloric acid respectively are:

Benzene on nitration gives nitrobenzene in presence of \( \mathrm{HNO_3} \) and \( \mathrm{H_2SO_4} \) mixture, where:

The INCORRECT statement regarding the structure of \( \text{C}_{60} \) is:

Amongst the following, the linear species is :

The spin-only magnetic moment value of \( \mathrm{B_2^{+}} \) species is ___ \( \times 10^{-2} \) BM . (Given : \( \sqrt{3} = 1.73 \) ]

A central atom in a molecule has two lone pair of electrons and forms three single bonds. The shape of this molecule is:

The correct shape and \(I–I–I\) bond angles respectively in \( \mathrm{I_3^-} \) ion are:

The total number of electrons in all bonding molecular orbitals of \( \mathrm{O_2^{2-}} \) is _______. (Round off to the nearest Integer).

Identify the species having one \( \pi \) bond and maximum number of canonical forms from the following:

Match List-I with List-II:

Choose the most appropriate answer from the options given below:

\( \mathrm{AB_3} \) is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is ______. (Integer answer)

Match List-I with List-II:

Choose the correct answer from the options given below:

In the following the correct bond order sequence is:

The number of species having non-pyramidal shape among the following is _______.
\( (A) \; \mathrm{SO}_3 \quad (B) \; \mathrm{NO}_3^{-} \quad (C) \; \mathrm{PCl}_3 \quad (D) \; \mathrm{CO}_3^{2-} \)

The interaction energy of London forces between two particles is proportional to \( r^{x} \), where \( r \) is the distance between the particles. The value of \( x \) is:

Which one of the following given graphs represents the variation of the rate constant \( k \) with temperature \( T \) for an endothermic reaction?

← PreviousQuestion 10 of 25Next →

JEE Main 2021 27th July Evening Shift

Number of \( \mathrm{Cl} = \mathrm{O} \) bonds in chlorous acid, chloric acid and perchloric acid respectively are: