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 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

Jahn-Teller effect is not observed in high spin complexes of?

1. d⁷

2. d⁸

3. d⁴

4. d⁹

Which of the following has the longest C ­—O bond length? (Free C—O bond length in CO is 1.128 Å)

Which of the following has the longest C ­—O bond length? (Free C—O bond length in CO is 1.128 )