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In the formation of some complexes, elec...

In the formation of some complexes, electrons in the metal orbital may undergo pairing against

A

Pauli's principle

B

Uncertainity principle

C

Hund's principle

D

Auf -bau rule

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The correct Answer is:
C
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Mesomerism is extended resonance. Atoms or groups with lone pairs of electrons release electrons when connected to doubly bonded carbons. It is +M effect. Unsaturated groups when connected to doubly bonded carbons withdraw pi electrons from the doubly bonded carbons. It is -M effect. Here the double bond is the unsaturated group should be between less electronegative atom and more electronegative atom. Mesomeric effect stabilizes or destabilizes the conjugate base of an acid. As a result the acid may be strong or weak has 4(OH) groups. Which -OH is a strong acid?

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AAKASH SERIES-COMPLEX COMPOUNDS -OBJECTIVE EXERCISE -1 (COMPLEX COMOUNDS)
  1. A ligand can not be ( A) neutral, (B) anionic , (C) anionic

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  2. Example of neutral complex compound in the following list

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  3. Alum in aqueous solution gives positive test for (A)K^(+) , (B) Al^(3...

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  4. Ni(CO)4 is an example of

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  5. Donor atoms in ethylenediamine are

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  6. First theory to explain the formation of complexes was proposed by

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  7. Primary valency denotes

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  8. Primary valency is satsified by

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  9. The coordination number of a central metal atom in a complex is determ...

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  10. Structure of the complex with sp^3 hybridisation

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  11. Inner complex is also called

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  12. The primary valency of 'Fe' in the complex K(4)[Fe(CN)(6)] is

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  13. The hybridisation of metal ion in square planar complexes in

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  14. The hybridisation of Iron in K(4)[Fe(CN)(6)] is

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  15. One mole of the complex compound CoCl3 xNH3 gives 3 moles of ions on d...

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  16. Number of chlorides satisfying secondary valency in CoCl3 . 4NH3

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  17. Total number of ions the complex CoCl3 .6NH3 gives in water

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  18. Effective atomic number of transition metal in potassium ferrocyanide

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  19. According to pauling the orbitals involved in the hybridisation to for...

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  20. In the formation of some complexes, electrons in the metal orbital may...

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