The colour imparted by Co(II) compounds to glass is

• green

• deep-blue

• yellow

• red

The number of possible isomers of an octahedral complex[Co(C₂O₄)₂(NH₃)₂]^- .

• 1

• 2

• 3

• 4

The ligands in anti-cancer drug cisplatin are

• NH_3, Cl

• NH₃, H₂O

• Cl, H₂O

• NO, Cl

The magnetic moment of K₃[Fe(CN)₆]  is found to be 1.7 BM .How many unpaired electron (s) is/are present per molecule ?

• 1

• 2

• 3

• 4

In [Ag(CN)₂]^-, the number of $\mathrm{\pi }$ bonds is

• 2

• 3

• 4

• 6

An aqueous solution of CoCl₂ on addition of excess of concentrated HCl turns blue due to formation of

• [Co(H₂O)₄Cl₂]

• [Co(H₂O)₂Cl₄]^2-

• [CoCl₄]^2-

• [Co(H₂O)₂Cl₂]

In which of the following pairs both the complexes show optical isomerism?

• cis-[Cr(C₂O₄)₂Cl₂]^3-, cis-[Co(NH₃)₄Cl₂]

• [Co(en)₃]Cl₃, cis-[Co(en)₂Cl₂]Cl

• [PtCl(dien)]Cl, [NiCl₂Br₂]^2-

• [Co(NO₃)₃(NH₃)₃], cis-[Pt(en)₂Cl₂]

The correct order for the wavelength of absorption in the visible region is

• [Ni(NO₂)₆]^4- < [Ni(NH₃)₆]²⁺ < [Ni(H₂O)₆]²⁺

• [Ni(NO₂)₆]^4- < [Ni(H₂O)₆]²⁺ < [Ni(NH₃)₆]²⁺

• [Ni(H₂O)₆]²⁺ < [Ni(NH₃)₆]²⁺ < [Ni(NO₂)₆]^4-

• [Ni(NH₃)₆]²⁺ < [Ni(H₂O)₆]²⁺ < [Ni(NO₂)₆]^4-

Which one ofthe following forms with an excess of CN^- (cyanide) a complex having coordination number two?

• Cu⁺

• Ag⁺

• Ni²⁺

• Fe²⁺

Which of the following is not considered as an organometallic compound?

• cis-Platin

• Ferrocene

• Zeise's salt

• Grignard reagent