The coordination number of cobalt in[Co(en)₂Br₂]Cl₂ is:

1. 2

2. 4

3. 6

4. 8

The correct IUPAC name of KAl(SO₄)₂.12H₂O is:

1. Aluminium potassium sulphate-12-water

2. Potassium aluminium(III)sulphate-12-water

3. Potassium aluminate(III)sulphatehydrate

4. Aluminium(III) potassium sulphate hydrate-12

The correct IUPAC name for Mn₃(CO)₁₂ is:

1. Dodecacarbonylmanganate(0)

2. Dodecacarbonylmanganate(II)

3. Dodecacarbonyltrimanganese(0)

4. Manganicdodecacarbonyl0)

The complex showing a spin-only magnetic moment of 2.82 B.M. is:

1. Ni(CO)₄

2. [NiCl₄]^2-

3. Ni(PPh₃)₄

4. [Ni(CN)₄]^2-

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 compound which does not show paramagnetism is:

1. [Cu(NH₃)₄]Cl₂

2. FeO

3. NO

4. N₂O₄

A solution containing 2.675 g of CoCl₃.6NH₃ (molar mass = 267.5 g mol^-1) is passed through a cation exchanger. The chloride ions obtained in the solution were treated with an excess of AgNO₃ to give 4.78 g of AgCl. Formula of the complex is (Atomic mass of Ag = 108u) :

1. [CoCl(NH₃)₅]Cl₂

2. $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_3$

3. [CoCl₂(NH₃)₄]Cl

4. [CoCl₃(NH₃)₃]

Trunbull's blue is :

1. ferricyanide

2. ferrous ferricyanide

3. ferrous cyanide

4. ferri ferrocyanide

The correct IUPAC name of AlCl₃(EtOH)₄ is :

1. Aluminium (II)Chloride-4-ethanol

2. Aluminium (III)Chloride-4-ethanol

3. Aluminium (IV)Chloride-4-hydroxy ethane

4. Aluminium Chloride-4-ethanol

Which has regular tetrahedral geometry?

1. [Ni(CN)₄]^-2

2. SF₄

3. [BF₄]^-

4. XeF₄