Urea reacts with water to form A which will decompose to form B. B when passed through \(\left(Cu\right)^{2 +}\) (aq), deep blue colour solution C is formed. What is the formula of C from the following?

1.	\(\left[Cu \left(NH_{3}\right)_{4}\right]^{2 +}\)	2.	\(Cu \left(\right. OH \left.\right)_{2}\)
3.	\(CuCO_{3} . Cu (OH)_{2}\)	4.	\(CuSO_{4}\)

A complex has a molecular formula MSO₄Cl.6H₂O. Its aqueous solution gives white precipitate with barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution.

If the secondary valence of the metal is six, the correct representation of the complex is:

1. [M(H₂O)₄Cl]SO₄.2H₂O
2. [M(H₂O)₆]SO₄  
3. [M(H₂O)₅Cl]SO₄.H₂O
4. [M(H₂O)₃Cl]SO₄.3H₂O

The chemical formula for tris(ethane-1,2-diamine)iron(II) phosphate is: 
1. [Fe(CH₃-CH(NH₂)₂)₃](PO₄)₃  
2. [Fe(H₂N-CH₂-CH₂-NH₂)₃](PO₄) 
3. [Fe(H₂N-CH₂-CH₂-NH₂)₃](PO₄)₂  
4. [Fe(H₂N-CH₂-CH₂-NH₂)₃]₃(PO₄)₂

The correct order of increasing field strength of ligands is:

1. ${\mathrm{SCN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{F}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{CN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{C}}_2{\mathrm{O}}_4^{2-}$

2. ${\mathrm{F}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{SCN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{C}}_2{\mathrm{O}}_4^{2-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{CN}}^{-}$

3. ${\mathrm{CN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{C}}_2{\mathrm{O}}_4^{2-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{SCN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{F}}^{-}$

4. ${\mathrm{SCN}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{F}}^{-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{C}}_2{\mathrm{O}}_4^{2-\hspace{0.17em}}<\hspace{0.17em}{\mathrm{CN}}^{-}$

The isomerism displayed by K₃[Co(NO₂)₆] and K₃[Co(ONO)₆] is: 

Which among the following complexes can exhibit isomerism?

Which of the following species can act as an oxidising agent?

1. $\left[\mathrm{Cr}{\left(\mathrm{CO}\right)}_6\right]$

2. $\left[\mathrm{Ni}{\left(\mathrm{CO}\right)}_4\right]$

3. $[\mathrm{Mn}{\left(\mathrm{CO}\right)}_6{]}^{+}$

4. $\left[\mathrm{V}{\left(\mathrm{CO}\right)}_6\right]$

Among the following compounds, the paramagnetic compound with two unpaired electrons is:

1. K₃[Fe(CN)₆]

2. K₂[NiCl₄]

3. K₂[CoCl₄]

4. Na₂[Ni(CN)₄]

When 0.1 mol of CoCl₃(NH₃)₅ is treated with an excess of AgNO₃, 0.2 mol of AgCl is obtained. The conductivity of the solution will correspond to:

The most stable complex species is : 

1. $\left[\mathrm{Fe}{\left(\mathrm{CO}\right)}_5\right]$

2. ${\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$

3. ${\left[\mathrm{Fe}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{3-}$

4. ${\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{+3}$