Which of the following complexes has lowest molar conductance?

• ${\mathrm{CoCl}}_3·3{\mathrm{NH}}_3$

• ${\mathrm{CoCl}}_3·4{\mathrm{NH}}_3$

• ${\mathrm{CoCl}}_3·5{\mathrm{NH}}_3$

• ${\mathrm{CoCl}}_3·6{\mathrm{NH}}_3$

402.

Select the diamagnetic complex ion amongst the following complexes (At. no. : Fe = 26,CO = 27)

• K₃[Fe(CN)₆]

• [Co(NH₃)₆)Cl₃

• K₃[FeF₆]

• K₃[CoF₆]

The correct charge on and co-ordination number of 'Fe' in K₃[Fe(CN)₆] is

• +2, 4

• +3, 6

• +2, 6

• +3, 3

Which of the following co-ordinate complexes is an exception to EAN rule? (Given, atomic number Pt = 78, Fe = 26, Zn = 30, Cu = 29)

• [Pt(NH₃)₆]⁴⁺

• [Fe(CN)₆]^4-

• [Zn(NH₃)₄]²⁺

• [Cu(NH₃)₄]²⁺

Consider the following two complex ions : [CoF₆]^3- and [Co(C₂O₄)₃]^3-. Which of the following statement(s) is/are false?

I. Both are octahedral.

II. [Co(C₂O₄)₃]^3- is diamagnetic while [CoF₆]^3- is paramagnetic.

III. Both are outer orbital complexes.

IV. In both the complexes, the central metal is in the same oxidation state.

• Both II and III

• II, III and IV

• Only III

• Both III and IV

Chlorophyll is a coordination compound of

• Iron

• Magnesium

• Manganese

• Zinc

The hybridised state of Al³⁺ in the complex ion formed when AlCl₃ is treated with aqueous acid is

• sp³

• dsp²

• sp³d²

• sp²d

Which of the following is a neutral complex?

• [Pt(NH₃)₂Cl₂]

• [Co(NH₃)₆]Cl₃

• [Ni(NH₃)₆]Cl₂

• K₄[Fe(CN)₆]

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-