81.

The correct statement with respect to the complexes [Ni(CO)₄] and [Ni(CN)₄]^2- is

• nickel is in the same oxidation state in both

• both have tetrahedral geometry

• both have square planar geometry

• have tetrahedral and square planar geometry respectively

The complex ion which has the highest magnetic moment among the following is

• [CoF₆]^3-

• [Co(NH₃)₆]³⁺

• [Ni(NH₃)₄]²⁺

• [Ni(CN)₄]^2-

When 0.01 mole of a cobalt complex is treated with excess silver nitrate solution, 4.305 g of silver chloride is precipitated. The formula of the complex is

• [Co(NH₃)₃Cl₃]

• [Co(NH₃)₅Cl]Cl₂

• [Co(NH₃)₆]Cl₃

• [Co(NH₃)₄Cl₂]NO

Which among the following statements are true for the complex [Co(NH₃)₆][Cr(CN)₆]?

1. It is a non-electrolyte
2. The magnitude of the charge on each complex ion is 3
3. The complex will not conduct current
4. The complex will exhibit coordination isomerism
5. The magnitude of the charge on each complex ion is 1

• 2 and 4

• 1 and 4

• 3 and 5

• 1 and 2

An example of ambidentate ligand is

• thiocyanato

• aquo

• chloro

• ammine

The primary and secondary valencies of chromium in the complex ion, dichlorodioxalatochromium (III), are respectively

• 3, 4

• 4, 3

• 3, 6

• 6, 3

(A) K₄[Fe(CN)₆]

(B) K₃[Cr(CN)₆]

(C) K₃(Co(CN)₆]

(D) K₂(Ni(CN)₄]

Select the complexes which are diamagnetic.

• (A), (B) and (C)

• (B), (C),and (D)

• (A), (C) and (D)

• (A), (B) and (D)

Which is not true of the co-ordination compound [Co(en)₂Cl₂]Cl?

• Exhibits geometrical isomerism

• Exhibits optical isomerism

• Exhibits ionisation isomerism

• Is an octahedral complex

The molecular formula of potash alum is

• KAl₂S₄H₄₈O₄₀

• K₂Al₂S₄H₄₈O₃₉

• K₂Al₂S₄H₄₈O₄₀

• KAl₂S₄H₄₈O₄₀

Aluminium reacts with NaOH and forms compound 'X'. If the coordination number of aluminiumin 'X' is 6, the correct formula of X is -

• [Al(H₂O)₄(OH)₂]⁺

• [Al(H₂O)₃(OH)₃]

• [Al(H₂O)₂(OH)₄]^-

• [Al(H₂O)₆](OH)₃