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Which combination will lead to pi-molecu...

Which combination will lead to `pi`-molecular orbitals ?
(i) 2px-2px (ii) 2pz+2pz (iii) 2s+2pz (iv) 2py+2py

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The correct Answer is:
(i) `overset(**)pi_(2px)(iv) pi_(2py)`
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Which of the follwing combinations are not permisible ? (i) 2pz and 2pz (ii) 2s and 2py (iii) 1s and 2s (iv) 2px and 2px

Assuming z-axis to be intermolecular axis, designate the molecule orbitals from the following combination. (i) 2px + 2px (ii) 2pz+2pz (iii) 2py-2py

Label the molecular orbitals formed by the following combinations of atomic orbitals (Assume z - axis as internuclear axis): (i) 2s+2s (ii) 2p_(x)-2p_(x) (iii) 2p_(z)+2p_(z) (iv) 1s-1s (v) 2p_(y)+2p_(y) .

If the z-axis is the molecular axis, then piMOs are formed by the overlap of (i) p_z and p_z (ii) p_y and p_y (iii) s and p_z (iv) p_x and p_x

2s and 2p- atomic orbitals combine to give how many 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 statements is correct ?

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 ?

What is the sum of radial and angular nodes in the following orbitals of H-atom? (I) Psi_(2px) , (ii) Psi_(2s) , (iii) Psi_(3d_(x)) , (iv) Psi_(3d_(x^(2)-y^(2)))

DINESH PUBLICATION-CHEMICAL BONDING AND MOLECULAR STRUCTURE -PROMBEMS FOR PRACTICE
  1. Can a sigma bond be formed in the absence of pi bond ?

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  2. Can orbitals present in the 2p sub-sheel hybridise alone ?

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  3. What types of hybridisation are associated with central atom when the ...

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  4. Write the state of hybridisation of boron in BF(3^.)

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  5. How many sigma and pi bonds are present in the molecule of ethene ?

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  6. Mention the state of hybridisation of all the carbon atoms in he molec...

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  7. Assuming z-axis to be intermolecular axis, designate the molecule orbi...

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  8. Which of the follwing combinations are not permisible ? (i) 2pz and ...

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  9. Which combination will lead to pi-molecular orbitals ? (i) 2px-2px (...

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  10. Can 1s and 2s atomic orbitals from molecular orbitals

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  11. In the molecular orbital configuration of N(2) which orbital has lower...

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  12. What is the bond order of H(2)^(-) ion ?

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  13. Arrenge O(2),O(2)^(-),O(2)^(2-),O(2)^(+) in increasing order of bond e...

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  14. What will happen to the bond order if the electron is added ot bonding...

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  15. Why does a molecule of Ne(2) fail to exist ?

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  16. Predict the stability of a molecule if N(a) gtN(b).

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  17. What type of magnetic behaviour is shown by a molecule containing unpa...

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  18. Name a molecule for which bond order is 3.

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  19. Out of O(2) and O(2)^(-) ion which has smaller bond order ?

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  20. Do H(2)^(+) and H(2)^(-) ions have same or different bond orders ?

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