Chemical Bonding and Molecular Structure

JEE Main 2024 (Online) 29th January Morning ShiftNumericalMedium📈 Topic in 29% papers+4

Ques. 1JEE Main 2024, 29 January (Morning Shift)

The number of species from the following which are paramagnetic and with bond order equal to one is . H2, He2+, O2+, N22-, O22-, F2, Ne2+, B2

Answer

B.O. = 12(Nb - Na); unpaired electrons from MO filling:

H2 (2e): B.O. 1, diamagnetic

He2+ (3e), Ne2+ (19e): B.O. 0.5

O2+ (15e): B.O. 2.5; N22- (16e, like O2): B.O. 2

O22-, F2 (18e): B.O. 1, diamagnetic

B2 (10e): *2s2 2px1 2py1 ⇒ B.O. 1, 2 unpaired e ⇒ paramagnetic

∴ only B2 satisfies both conditions

Answer: 1

Ques. 2JEE Main 2024, 29 January (Morning Shift)

Number of compounds with one lone pair of electrons on central atom amongst following is . O3, H2O, SF4, ClF3, NH3, BrF5, XeF4

Ques. 3JEE Main 2024, 29 January (Evening Shift)

The total number of molecules with zero dipole moment among CH4, BF3, H2O, HF, NH3, CO2 and SO2 is .

Ques. 4JEE Main 2024, 29 January (Evening Shift)

The total number of anti bonding molecular orbitals, formed from 2s and 2p atomic orbitals in a diatomic molecule is .

Ques. 5JEE Main 2024, 27 January (Morning Shift)

Choose the polar molecule from the following:

Ques. 6JEE Main 2024, 27 January (Morning Shift)

Sum of bond order of CO and NO+ is .

Ques. 7JEE Main 2024, 27 January (Evening Shift)

The number of non-polar molecules from the following is . HF, H2O, SO2, H2, CO2, CH4, NH3, HCl, CHCl3, BF3

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