Fe₂(CO)₉ is diamagnetic.Which of the following reasons is correct?

1. Presence of one CO as bridge group

2. Presence of monodentate ligand

3. Metal-metal(Fe-Fe) bond in molecule

4. Resonance hybridization of CO

From the stability constant (hypothetical  values)given below, predict which is the strongest ligand?

1. Cu²⁺+4NH₃$\rightleftharpoons$[Cu(NH₃)₄]²⁺;(k=4.5x10¹¹)

2. Cu²⁺+4CN$\rightleftharpoons$[Cu(CN)₄]^2-;(K=2.0x10²⁷)

3. Cu²⁺+2en$\rightleftharpoons$[Cu(en)₂]²⁺;(K=3.0x10¹⁵)

4. Cu²⁺+4H₂O$\rightleftharpoons$[Cu(H₂O)₄]²⁺;(K=9.5x10⁸)

Which does not obey EAN rule?

1. [Cu(NH₃)₄]²⁺

2. [Zn(OH)₄]^2-

3. [HgI₄]^2-

4. Fe(CO)₅

The coordination number and oxidation state of Cr in K₃[Cr(C₂O₄)₃] are respectively

1. 3 and +3

2. 3 and 0

3. 6 and +3

4. 4 and +2

The octahedral complex will not show geometrical isomerism is :
(A and B are monodentate ligands)

1. [MA₄B₂]

2. [MA₅B]

3. [MA₂B₄]

4. [MA₃B₃]

What is the correct IUPAC name for sodium nitroprusside?

1. Sodium pentacyanonitrosyl ferrate(II)

2. Sodium pentacyanonitrosyl ferrate(III)

3. Sodium nitroferricyanide

4. Sodium nitroferrocyanide

The compound that is not  $\mathrm{\pi }$-bonded organometallic compound is :

1. K[PtCl₃(${\eta }^{\mathit{2}}$-C₂H₄)]

2. Fe(${\eta }^5$-C₅H₅)₂

3. Cr(${\eta }^6$-C₆H₆)₂

4. (CH₃)₄Sn

IUPAC name of [Pt(NH₃)₃(Br)(NO₂)Cl]Cl is:

Which of the following cation does not form an amine complex with excess of ammonia?

1. Ag⁺

2. Cu²⁺

3. Cd²⁺

4. Na⁺

The denticity of EDTA is: