Chemistry Question Bank

Accordingly MO theory (a) O is paramagnetic and bond order is greater than O2. (b) Ois paramagnetic and bond order is less than O2. (c) Ois diamagnetic and bond order is less than O2. (d) Ois diamagnetic and bond orde…

Using MO theory, predict which of the following species has the shortest bond length? (a) O (b) O (c) O (d) O Ans. (d) Sol. As we know, Bond length 1/bond order. In option A, Ohas bond order 2.5 In option B, Ohas bo…

Which one of the following is not paramagnetic?

The number of anti-bonding electron pairs in O molecular ion on the basis of molecular orbital theory is (atomic no. of O is 8):

The ion that is isoelectronic with CO is:

The ground state electronic configuration of valence shell electrons in nitrogen molecule (N2) is written * , , 2 , 2p 2p x y z s s p .Hence,the bond order in nitrogen molecule is :

Which of the following is paramagnetic? (a) O

Take NA as the number of Anti-bonding molecular orbitals and NB as the number of Bonding molecular orbitals. The molecule is stable when NA ____________ NB. a) is greater than b) is equal to c) is less than d) is grea…

Which one of the following species is diamagnetic in nature ? (a) H (b) H (c) H (d) He

Which of the following have identical bond order? (I) CN– (II) O2 (III) NO+ (IV) N2

The molecular orbitals like atomic orbitals are filled in accordance with the

The number of molecular orbitals formed is equal to the number of combining atomic orbitals. When two atomic orbitals combine, two molecular orbitals are formed one is known as bonding molecular orbital while the othe…

The condition to form a molecular orbital from atomic orbital is

The increasing order of energies of various molecular orbitals are I. ls < ls < 2s < ( 2 ) ( ) II. ls < ls < 2s < ( 2 ) ( ) z x y x y z x y z x y z s P P P P P P s P P P P P P

The structure and hybridization of Si(CH3)4 is :

The hybridization of atomic orbitals of the central atom “Xe” in XeO4, XeO2F2, and XeOF4 respectively.

Select pair of compounds in which both have different hybridization but have same molecular geometry:

Which of the following does not represent positive overlap? (a) (b) (c) (d) Ans. (b) Sol. Out of phase overlap occurs in (b) Thus, it shows negative overlap.

The valence bond theory explains the shape, the formation and directional properties of bonds in polyatomic molecules like CH4, NH3 and H2O etc., in terms of

VBT theory is based on the

FAsF bond angle in AsF3Cl2 molecule is:

Which of the following are isoelectronic and isostructural? NO ,CO ,ClO ,SO (a) NO ,CO (b) SO ,NO (c) ClO ,CO (d) CO ,ClO Ans. (a) Sol. Both have 32 electrons and have trigonal planar shape.

Which is not correctly matched?

The shapes of XeF4, Θ XeF and SnCl2 are:

Which of the following pairs of species have identical shapes? (a) NO and NO