Coordination Compounds

Vitamin B12 contains

1. Fe(II)
2. Co(III)
3. Zn(II)
4. Ca(II)

The number of unpaired electrons in the complex ion [CoF6]3- is (Atomic no. : Co = 27)

1. 2
2. 3
3. 4
4. zero

Among the following which is not the -bonded organometallic compound?

1. K[PtCl3( 2-C2H4)]
2. Fe( 5-C5H5)2
3. Cr( 6-C6H6)2
4. (CH3)4Sn

Atomic number of Cr and Fe are respectively 24 and 26, which of the following is paramagnetic with the spin of electron?

1. [Cr(CO)6]
2. [Fe(CO)5]
3. [Fe(CN)6]4-
4. [Cr(NH3)6]3+

The hypothetical complex chloro diaquatriammine cobalt(III) chloride can be represented as

1. [CoCl(NH3)3(H2O)2]Cl2
2. [Co(NH3)3(H2O)Cl3]
3. [Co(NH2)3(H2O)2Cl]
4. [Co(NH3)3(H2O)3]Cl3

In the silver plating of copper, K[Ag(CN)2] is used instead of AgNO3. The reason is

1. a thin layer of Ag is formed on Cu
2. more voltage is required
3. Ag+ ions are completely removed from solution
4. less availability of Ag+ ions, as Cu cannot displace Ag from [Ag(CN)2]- ion.

CuSO4 when reacts with KCN forms CuCN, which is insoluble in water. It is soluble in excess of KCN, due to formation of the following complex

1. K2[Cu(CN)4]
2. K3[Cu(CN)4]
3. CuCN2
4. Cu[KCu(CN)4]

Which of the following will give maximum number of isomers?

1. [Co(NH3)4Cl2]
2. [Ni(en)(NH3)4]2+
3. [Ni(C2O4)(en)2]
4. [Cr(SCN)2(NH3)4]+

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

1. 3
2. 6
3. 4
4. 2

Which of the following organometallic compounds is and bonded?

1. [Fe( 5-C5H5)2]
2. K[PtCl3( 2-C2H4)]
3. [Co(CO)5NH3]2+
4. Fe(CH3)3