What are the spin only magnetic moments (in BM) for Ni (II) ion in square planar arid octahedral geometry, respectively?

• 0 and 2.83

• 2.83 and 2.83

• O and 1.73

• O and O

Which one of the following is used for the estimation of hardness of water:

• E.D.T.A

• Dimethyl glyoxime

• Ethylene diamine

• Triphenyl phosphine

The coordination number of Fe[Fe(CN)₆]^4- , [Fe(CN)₆]^3- and [FeCl₄]^- respectively:

• 6 , 3 , 3

• 6 , 4 , 6

• 6 , 6 , 4

• 2 , 3 , 3

Intramolecular hydrogen bonding is present is:

• nickel dimethyl glyoximate

• anti-pyridine-2-carboxaldoxime

• maleic acid monoanion

• All of the above

The total number of possible isomers of the complex compound [Cu^II(NH₃)₄][Pt^IICl₄] is:

• 3

• 6

• 5

• 4

The solution of the complex [Cu(NH₃)₄]SO₄ in water:

• will give the test of Cu²⁺ ions

• will give the test of NH₃

• will give the test of ${\mathrm{SO}}_4^{2-}$ ions

• will not give the tests of any of the above species

247.

In the complex [Co(en)₂Cl₂ ] Br, the co-ordination number and oxidation state of cobalt are

• 6 and +1

• 6 and +3

• 3 and +3

• 4 and +2

The crystal field splitting for Cr³⁺ ion in an octahedral field increases for ligands I^- , H₂O , NH₃ , CN^- and the order is :

• I^- < H₂O < NH₃ < CN^-

• CN^- < I^- < H₂O < NH₃

• CN^- < NH₃ < H₂O < I^-

• NH₃ < H₂O < I^- < CN^-

Assertion : Co[Hg(SCN)₆] and Hg [Co(SCN)₆] are isomers.

Reason : SCN^- is a stronger ligand as compared to NCS^-.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false.

• If both assertion and reason are false

Least coordination number is shown by

• Co₂(CO)₈

• Mn₂(CO)₁₀

• [Fe(en)₂NH₃]

• [Cr(OH)₃(NH₃)₃]