The crystal field stabilization energy (CFSE) for [CoCl₆]^4- is 18000 cm^-1.
The CFSE for [CoCl₄]^2-  will be:

1. $6000$ $c{m}^{-1}$

2. $16000$ $c{m}^{-1}$

3. $18000$ $c{m}^{-1}$

4. $8000$ $c{m}^{-1}$

What is the correct electronic configuration of the central atom in ${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$ based on crystal field theory?

1.  ${\mathrm{e}}^4$ ${\mathrm{t}}_2^2$

2.  ${\mathrm{t}}_{2\mathrm{g}}^{}$ $$ $4$ ${\mathrm{e}}_{\mathrm{g}}^2$

3.  ${\mathrm{t}}_{2\mathrm{g}}^{}$ $$ $6$ ${\mathrm{e}}_{\mathrm{g}}^0$

4.  ${\mathrm{e}}^3$ ${\mathrm{t}}_2^3$

The correct order of increasing field strength of ligands is:

1. ${\mathrm{SCN}}^{- }< {\mathrm{F}}^{- }< {\mathrm{CN}}^{- }< {\mathrm{C}}_2{\mathrm{O}}_4^{2-}$

2. ${\mathrm{F}}^{- }< {\mathrm{SCN}}^{- }< {\mathrm{C}}_2{\mathrm{O}}_4^{2- }< {\mathrm{CN}}^{-}$

3. ${\mathrm{CN}}^{- }< {\mathrm{C}}_2{\mathrm{O}}_4^{2- }< {\mathrm{SCN}}^{- }< {\mathrm{F}}^{-}$

4. ${\mathrm{SCN}}^{- }< {\mathrm{F}}^{- }< {\mathrm{C}}_2{\mathrm{O}}_4^{2- }< {\mathrm{CN}}^{-}$

Ethylene diaminetetraacetate (EDTA) ion is:

Match Column I with Column II, Columns I and II represent complexes and magnetic moment (BM) respectively. 

Choose the correct answer from the options given below:

The number of bridging carbonyl groups in [Co₂(CO)₈] and [Mn₂(CO)₁₀], respectively are:
1. 2 and 0
2. 2 and 2
3. 2 and 4
4. 0 and 2

The correct order of spin-only magnetic moment for the given complexes is: 

1. \([Co(H_2O)_6]^{2+} > [MnCl_6]^{3-} > [Fe(CN)_6]^{3-} \)
2. \([Fe(CN)_6]^{3-} >[Co(H_2O)_6]^{2+} > [MnCl_6]^{3-} \)
3. \([MnCl_6]^{3-} >[Fe(CN)_6]^{3-} >[Co(H_2O)_6]^{2+} \)
4. \([MnCl_6]^{3-} > [Co(H_2O_6]^{2+} > [Fe(CN)_6]^{3-} \)