Molecular orbital theory

28 questions on Molecular orbital theory from the Chemical Bonding chapter: 6 NEET level, 12 JEE Main, 10 JEE Advanced. Each one opens with its answer and solution.

• According to molecular orbital theory, the bond order of N2 is NEET level
• Which of the following molecules is paramagnetic according to molecular orbital theory? NEET level
• The total number of electrons present in the valence antibonding molecular orbitals of O2 is NEET level
• The bond order of H2^+ is NEET level
• Among O2, O2^+, O2^- and O2^2-, the species with the longest bond length is NEET level
• The helium molecule He2 is not known under ordinary conditions because, according to MO theory, NEET level
• Which of the following species has a bond order of 3 according to MO theory? JEE Main level
• Which statement about B2 and C2 is correct according to MO theory? JEE Main level
• On converting N2 to N2^+, the bond length and magnetic behaviour change as JEE Main level
• The number of unpaired electrons in the superoxide ion O2^- is JEE Main level
• Which species has the highest bond dissociation energy? JEE Main level
• In which of the following molecules does the sigma 2p_z molecular orbital lie higher in energy than the pi 2p_x and pi 2p_y orbitals? JEE Main level
• The correct order of N-O bond length in NO^+, NO and NO^- is JEE Main level
• Which of the following species is diamagnetic? JEE Main level
• The number of nodal planes in the pi^*2p_x antibonding molecular orbital of a homonuclear diatomic molecule (internuclear axis along z) is JEE Main level
• With the internuclear axis along z, which pair of atomic orbitals on the two atoms has zero net overlap by symmetry? JEE Main level
• According to MO theory, the C2 molecule contains JEE Main level
• According to MO theory, find the value of (bond order of O2^+) - (bond order of O2^2-). Give the answer to two decimal places. JEE Main level
• Upon ionisation to the cation, the bond lengths of N2 and O2 change respectively as JEE Advanced level
• Which set contains species that all have the same bond order and are all diamagnetic? JEE Advanced level
• The number of electrons in O2 (valence shell only) that occupy molecular orbitals possessing a nodal plane that contains the internuclear axis is JEE Advanced level
• Which of the following species gains stability (its bond order increases) when it accepts one additional electron? JEE Advanced level
• The highest occupied molecular orbitals (HOMO) of N2 and O2 respectively are JEE Advanced level
• Which of the following statements about the oxygen species O2, O2^+, O2^- and O2^2- is/are correct? JEE Advanced level
• Which of the following statements about C2 is/are correct according to MO theory? JEE Advanced level
• Which of the following species is/are paramagnetic with a bond order of 2.5? JEE Advanced level
• Which of the following statements about molecular orbitals is/are correct? JEE Advanced level
• In which of the following changes does the bond length decrease? JEE Advanced level