In which of the following octahedral complexes of Co (At. no. 27), will the magnitude of ${∆}_{\circ }$ be the highest?

• [Co(CN)₆]^3-

• [Co(C₂O₄)₃]^3-

• [Co(H₂O)₆]³⁺

• [Co(NH₃)₆]³⁺

The IUPAC name for the complex [Co(NO₂)(NH₃)₅]Cl, is

• nitrito-N-pentammine cobalt (III) chloride

• nitrito-N-pentammine cobalt (II) chloride

• pentaminenitrito-N-cobalt (II) chloride

• pentaminenitrito-N-cobalt (III) chloride

[Co(NH₃)₄Cl₂]NO₂ and [Co(NH₃)₄ClNO₂]Cl exhibit whcih type of isomerism?

• Geometrical

• Optical

• Linkage

• Ionisation

1. Which of the following compounds is not coloured?

• Na₂[Cu(Cl)₄]

• Na[Cd(Cl)₄]

• K₄[Fe(CN)₆]

• K₃[Fe(CN)₆]

Coordination number of Ni in [Ni(C₂O₄)₃]^4- is

• 3

• 6

• 4

• 5

Aluminium reacts with NaOH and forms compound 'X'. If the coordination number of aluminium in '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

The IUPAC name of the given compound [Co(NH₃)₅Cl]Cl₂ is

• penta amino cobalt chloride chlorate

• cobalt penta ammine chloro chloride

• pentamine chloro cobalt (III) chloride

• penta amino cobalt (III) chlorate

When SCN^- is added to an aqueous solution containing Fe(NO₃)₃, the complex ion produced is

• [Fe(OH₂)₂(SCN)]²⁺

• [Fe(OH₂)₅(SCN)]²⁺

• [Fe(OH₂)₈(SCN)]²⁺

• [Fe(OH₂)(SCN)]⁶⁺

The number of unpaired electrons calculated in [Co(NH₃)₆]³⁺ and [CoF₆]^3- are

• 4 and 4

• 0 and 2

• 2 and 4

• 0 and 4

Which of the following is hexadentate ligand?

• Ethylene diamine

• Ethylene diamine tetra acetic acid

• 1, 10-phenanthroline

• Acetyl acetonato