Iron carbonyl, $\mathrm{Fe}{\left(\mathrm{CO}\right)}_5$ is:

The geometry and magnetic behaviour of the complex [Ni(CO)₄] respectively are:

1. Square planar and diamagnetic.

2. Tetrahedral and diamagnetic.

3. Square planar and paramagnetic.

4. Tetrahedral and paramagnetic.

The correct order of the stoichiometrics of AgCl formed when AgNO₃ in excess is treated with the complexes:- CoCl₃.6NH₃, CoCl₃.5NH₃, CoCl₃.4NH₃, respectively, is :

1. 1 AgCl, 3 AgCl, 2 AgCl

2. 3 AgCl, 1 AgCl, 2 AgCl

3. 3 AgCl, 2 AgCl, 1 AgCl

4. 2 AgCl, 3AgCl,  1 AgCl

An example of a sigma bonded organometallic compound is:

1. Grignard's reagent

2. Ferrocene

3. Cobaltocene

4. Ruthenocene

The correct increasing order for the wavelengths of absorption in complexes of Co³⁺ is:

1. [Co(H₂O)₆]³⁺ < [Co(en)₃]³⁺ < [Co(NH₃)₆]^{3 +}

2. [Co(H₂O)₆]³⁺ <  [Co(NH₃)₆]³⁺ <  [Co(en)₃]³⁺

3. [Co(NH₃)₆]³⁺ < [Co(en)₃]³⁺ < [Co(H₂O)₆]³⁺

4. [Co(en)₃]³⁺ <  [Co(NH₃)₆]³⁺ < [Co(H₂O)₆]³⁺

The correct statement among the following regarding [Mn(CN)₆]^3-is:

1. It is sp³d² hybridized and tetrahedral.

2. It is d²sp³ hybridized and octahedral.

3. It is dsp² hybridised and square planar.

4. It is sp³d² hybridised and octahedral.

The correct increasing order of trans-effect of the following species is

1. NH₃ > CN^- > Br^- > C₆H₅^-

2. CN^- > C₆H₅^- > Br^- > NH₃

3. Br^- > CN^- >NH₃ > C₆H₅^-

4. CN^- > Br^- >C₆H₅^- >NH₃

Which of the following has longest C-O bond length? (Free C-O bond length in CO is

1.128 Å.)

1. [Co(СО)₄]^-

2. [Fe(CO)₄]^2-

3. [Mn(CO)₆]⁺

4. Ni(CO)₄

Which of the following statements is false?

1. Ca²⁺ ions are important in blood clotting

2. Ca²⁺ ions are not important in maintaining the regular beating of the heart

3. Mg²⁺ ions are important in the green parts of plants

4. Mg²⁺ ions form a complex with ATP