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Standard XII
Chemistry
Covalent Bond vs Ionic Bond
Select the co...
Question

Select the correct statements for non-bonding and anti-bonding orbitals

A
Non-bonding orbitals have same energy than the atomic orbitals from which they are formed
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B
Anti-bonding orbitals have higher energy than the atomic orbitals from which they are formed
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C
Non-bonding orbitals have lower energy than the atomic orbitals from which they are formed
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D
Anti-bonding orbitals have lower energy than the atomic orbitals from which they are formed
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Solution

The correct options are
B Anti-bonding orbitals have higher energy than the atomic orbitals from which they are formed
C Non-bonding orbitals have same energy than the atomic orbitals from which they are formed
Non-bonding orbitals have same energy than the atomic orbitals from which they are formed. This is because they do not mix.Hence, the option A is correct.
Anti-bonding orbitals have higher energy than the atomic orbitals from which they are formed. This is because these are obtained by substraction of the wave function.
Thus, the option B is correct and the option D is incorrect.

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Q. According to MOT (Molecular Orbital Theory), the molecular orbitals are formed by mixing of atomic orbitals through LCAO (linear combination of atomic orbitals). The correct statement (s) about molecular orbitals is/are Statement (a) : bonding molecular orbitals are formed by addition of wave-functions of atomic orbitals of same phase Statement (b) : anti-bonding molecular orbitals do not take part in bond formation because they belong to inner shells Statement (d) : anti-bonding molecular orbitals provide stability to molecules while bonding molecular orbitals make the molecules unstable.
Q. According to MOT, two atomic orbitals overlap resulting in the formation of molecular orbitals. Number of atomic orbitals overlapping together is equal to the molecular orbital formed. The two atomic orbital thus formed by LCAO (linear combination of atomic orbital) in the same phase or in the different phase are known as bonding and antibonding molecular orbitals respectively. The energy of bonding molecular orbital is lower than that of the pure atomic orbital by an amount Δ. This known as the stabilization energy. The energy of antibonding molecular orbital is increased by Δ′ (destabilization energy).
How many nodal plane(s) is/are present σ(s and p) in bonding molecular orbital?
Q. According to MOT, two atomic orbitals overlap resulting in the formation of molecular orbitals. Number of atomic orbitals overlapping together is equal to the molecular orbital formed. The two atomic orbital thus formed by LCAO (linear combination of atomic orbital) in the same phase or in the different phase are known as bonding and antibonding molecular orbitals respectively. The energy of bonding molecular orbital is lower than that of the pure atomic orbital by an amount Δ. This known as the stabilization energy. The energy of antibonding molecular orbital is increased by Δ′ (destabilization energy).
Which of the following statement(s) is(are) true:
Q. When two atomic orbitals combine, energy of bonding molecular orbital is lowered by x while that anti bonding molecular orbital is raised by y. Then:
Q.

The hybrid orbitals are less effective in forming stable bonds than pure atomic orbitals.


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