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Molecular orbitals can best be approxima...

Molecular orbitals can best be approximated by the .....combination of ............ orbitals.

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linear, atomic
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How many molecular orbitals are formed by the combination of two lithium atoms?

Label the molecular orbitals formed by the following combinations of atomic orbitals if Z-axis is the internuclear axis. 1 s - 1s

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Label the molecular orbitals formed by the following combinations of atomic orbitals if Z-axis is the internuclear axis. 2p_x -2p_x

Label the molecular orbitals formed by the following combinations of atomic orbitals if Z-axis is the internuclear axis. 2p_z - 2P_z

A p-orbital can accommodate

A pi -molecular orbital is formed by the ............ overlapping of atomic orbitals.

Comprehension given below is followed by some multiple choice question, Each question has one correct options. 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 hte 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 sigma1s lt sigma^(star)1sltsigma^(star)2slt((pi2p_(x))=(pi2p_(y)))ltsigma2p_(z)lt(pi^(star)2p_(x) = pi^(star)2p_(y))ltsigma^(star)2p_(z) and For oxygen and fluorine order of enregy of molecules orbitals is given below. sigma1s lt sigma^(star)1s lt sigma2s lt sigma^(star)2s lt sigmap_(z) lt (pi2p_(x) ~~ pi2p_(y)) lt (pi^(star)2p_(x)~~ pi^(star)2py) lt sigma^(star)2p_(z) Different atomic orbitalsof one atom combine with those atoms 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, sigma andif the overlap is lateral, the molecular orbital is called pi, pi . 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. In which of the following molecules, sigma2p_(z) molecular orbital is filled after pi2p_(x) and pi2p_(y) molecular orbitals?

Molecular orbitals are formed by the overlap of atomic orbitals. Two atomic orbitals combine atom from two molecular orbitals called vonding molecular orbital (BOM) 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 nitrogne increase in the order : sigma_(1s)ltsigma_(1s)^(**)ltsigma_(2s)ltsigma_(2s)^(**)lt(pi_(2py)~~pi_(2py))lt sigma_(2py)lt(pi_(2py)^(**)~~pi_(2py)^(**))ltsigma_(2pz)^(**) and for ozygen and fluorine order of energy of molecular orbitals id given below : sigma_(1s)ltsigma_(1s)^(**)ltsigma_(2s)ltsigma_(2s)^(**)ltsigma_(2pz)lt(pi _(2px)^(**)~~pi_(2py)^(**))sigma_(2pz)^(**) Different atomic orbitals of one atom combine wiht the atomic orbitals of the second atom whihc have comparable energies and proper orientation. Further, if the overlapping is head on, the molecular orbital is called 'Sigma' (sigma) and if the overlap is atreal, the molecular orbital is called 'pi', (pi). 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 the most ipmrtaint parameters to compare the strength of bonds. Which of the following pair is expected to have the same bond order ?

ICSE-CHEMICAL BONDING AND MOLECULAR STRUCTURE-FILL IN THE BLANKS TYPE QUESTIONS
  1. Polarisation is favoured when cation is ............ and anion is

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  2. Hydrogen bond energy is around ............ kJ mol^(-1)

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  3. Paramagnetism is shown by the molecules which have

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  4. Fill in the blanks by chossing the appropriate word/words from those g...

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  5. Molecular orbitals can best be approximated by the .....combination of...

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  6. According to Bohr's theory, the angular momentum of an electron in 5^(...

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  7. The bond multiplicity leads to ............ in bond distance.

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  8. A pi-molecular orbital is formed by the ............ overlapping of at...

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  9. A molecule is unstable when the bond order is .. ..........or ...........

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  10. Among N(2)^(+), N(2)^(-) and N(2)^(2-) the least stable ion is .........

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  11. The bond order of O(2)^(2-) ion is ............ and the ion is ..........

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  12. Assertion :-The formation of a chemical bond involves a decrease in th...

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  13. Assertion :- A low value of ionisation energy of the electropositive ...

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  14. Assertion :- CH4 obeys the octet rule. Reason :- During the formati...

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  15. Assertion :- The observed bond angle in NH3 molecule is less than 109^...

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  16. Assertion :-The o-bond is stronger as compared to a pi-bond. Reason ...

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  17. Assertion :-The acetylene molecule is linear in shape. Reason :- Th...

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  18. Assertion :- The net dipole moment of BF3 is zero. Reason :- The ne...

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  19. Assertion :-Structures : overset(* * )(N^(-)) = overset(+ )N = overset...

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  20. Assertion :-Among O(2)^(+ ) ,O(2),O(2)^(-) and O(2)^(2-) species, O2 ...

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