Q. 65

Which of the following statements is correct?

(i) In the formation of dioxygen from oxygen atoms 10 molecular orbitals will be formed.

(ii) All the molecular orbitals in the dioxygen will be completely filled.

(iii) Total number of bonding molecular orbitals will not be same as total number of anti bonding orbitals in dioxygen.

(iv) Number of filled bonding orbitals will be same as number of filled anti bonding orbitals

Answer :

(i)

Two molecular orbitals in the dioxygen have unpaired electrons.


Thus, statement (ii) is incorrect.


The total number of bonding molecular orbitals is the same as the total number of antibonding orbitals in dioxygen.


Thus, the statement (iii) is incorrect.


The number of filled bonding orbitals will not be always the same as a number of filled antibonding orbitals.


Thus, the statement (iv) is incorrect.


Thus, statement (i) is correct i.e. in the formation of dioxygen from oxygen atoms 10 molecular orbitals will be formed.


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PREVIOUS(i)Discuss the concept of hybridization. What are its different types in a carbon atom?(ii) What is the type of hybridisation of carbon atoms marked with star.Comprehension given below is followed by some multiple choice questions. Each question has one correct option. Choose the correct option.Molecular orbitals are formed by the overlap of atomic orbitals. Two atomic orbitals combine to form two molecular orbitals called bonding molecular orbital (BMO) and anti bonding molecular orbital (ABMO). Energy of anti bonding orbital is raised above the parent atomic orbitals that have combined and the energy of the bonding orbital is lowered than the parent atomic orbitals. Energies of various molecular orbitals for elements hydrogen to nitrogen increase in the order :σσ < σ *1s < σ2s < (π2px = π2py) < σ2p2 < σ2pz < (π * 2px = π*2py) < σ* 2pz s ( p p) p ( * p * p) * p < and for oxygen and fluorine order of energy of molecular orbitals is given below :σls < σ* 1s < σ2s < σ* 2s < σ2pz < (π2px = π2py) < (π* 2px = π * 2py) < σ* 2pzDifferent atomic orbitals of one atom combine with those atomic orbitals of the second atom which have comparable energies and proper orientation. Further, if the overlapping is head on, the molecular orbital is called ‘Sigma’, (σ) and if the overlap is lateral, the molecular orbital is called ‘pi’, (π). The molecular orbitals are filled with electrons according to the same rules as followed for filling of atomic orbitals. However, the order for filling is not the same for all molecules or their ions. Bond order is one of the most important parameters to compare the strength of bonds.NEXTWhich of the following molecular orbitals has a maximum number of nodal planes?(i) σ*1s(ii) σ*2pz(iii) π2px(iv) π*2py