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Ammonia acts as a very good ligand but ammonium ion does not form complexes because:
  • a)
    NH3 is a gas while NH4+ is in liquid form
  • b)
    NH3 undergoes sp3 hybridization while NH4+ undergoes sp3d hybridization
  • c)
    NH4+ ion does not have any lone pair of electrons
  • d)
    NH4+ ion has one unpaired electron while NH3 has two unpaired electrons
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Ammonia acts as a very good ligand but ammonium ion does not form comp...

Explanation:

NH4 ion does not have any lone pair of electrons:
- Ammonia (NH3) has a lone pair of electrons on the nitrogen atom, which allows it to act as a ligand and form complexes with transition metals.
- However, the ammonium ion (NH4) does not have any lone pairs of electrons since all four hydrogen atoms are bonded to the nitrogen atom.
- As a result, the ammonium ion cannot act as a ligand and does not form complexes with transition metals.

Therefore, the correct answer is option 'C' - NH4 ion does not have any lone pair of electrons.
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Community Answer
Ammonia acts as a very good ligand but ammonium ion does not form comp...
  • Ammonia acts as a very good ligand but ammonium ion does not form complexes because NH4+ ion does not have any lone pair of electrons.
  • Complexes are formed by the donation of a pair of electrons from ligand to metal. In ammonia, N atom has one lone pair of electrons. So it can form complexes. 
  • Nitrogen donates this lone pair of electrons to the proton to form an ammonium ion. NH4+ ion does not possess any lone pair of electrons which it can donate to central metal ion therefore it does not form complexes. 
  • Thus, Ammonia can be a very good ligand but ammonium ion does not form complexes.
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Crystal field theory views the bonding in complexes as arising from electrostatic interaction and considers the effect of the ligand charges on the energies of the metal ion d-orbitals.In this theory, a ligand lone pair is modelled as a point negative charge that repels electrons in the d-orbitals of the central metal ion. The theory concentrated on the resulting splitting of the d-orbitals in two groups with different energies and used that splitting to rationalize and correlate the optical spectra, thermodynamic stability, and magnetic properties of complexes. This energy splitting between the two sets of dorbitals is called the crystal field splitting D.In general, the crystal field splitting energy D corresponds to wavelength of light in visible region of the spectrum, and colours of the complexes can therefore be attributed to electronic transition between the lower-and higher energy sets of d-orbitals.In general, the colour that the we see is complementry to the colour absorbed.Different metal ion have different values of D, which explains why their complexes with the same ligand have different colour.Similarly, the crystal field splitting also depends on the nature of ligands and as the ligand for the same metal varies from H2O to NH3 to ethylenediamine, D for complexes increases. Accordingly, the electronic transition shifts to higher energy (shorter wavelength) as the ligand varies from H2O to NH3 to en, thus accounting for the variation in colour.Crystal field theory accounts for the magnetic properties of complexes in terms of the relative values of and the spin pairing energy P. Small values favour high spin complexes, and large Dvalues favour low spin complexes.Which of the following statements is incorrect?

Ammonia acts as a very good ligand but ammonium ion does not form complexes because:a)NH3is a gas while NH4+is in liquid formb)NH3undergoes sp3hybridization while NH4+undergoes sp3d hybridizationc)NH4+ion does not have any lone pair of electronsd)NH4+ion has one unpaired electron while NH3has two unpaired electronsCorrect answer is option 'C'. Can you explain this answer?
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Ammonia acts as a very good ligand but ammonium ion does not form complexes because:a)NH3is a gas while NH4+is in liquid formb)NH3undergoes sp3hybridization while NH4+undergoes sp3d hybridizationc)NH4+ion does not have any lone pair of electronsd)NH4+ion has one unpaired electron while NH3has two unpaired electronsCorrect answer is option 'C'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Ammonia acts as a very good ligand but ammonium ion does not form complexes because:a)NH3is a gas while NH4+is in liquid formb)NH3undergoes sp3hybridization while NH4+undergoes sp3d hybridizationc)NH4+ion does not have any lone pair of electronsd)NH4+ion has one unpaired electron while NH3has two unpaired electronsCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Ammonia acts as a very good ligand but ammonium ion does not form complexes because:a)NH3is a gas while NH4+is in liquid formb)NH3undergoes sp3hybridization while NH4+undergoes sp3d hybridizationc)NH4+ion does not have any lone pair of electronsd)NH4+ion has one unpaired electron while NH3has two unpaired electronsCorrect answer is option 'C'. Can you explain this answer?.
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