The coloured complex ions among the following are
`[Ti(H_(2)O)_(6)]^(+3)`
`[Zn(OH)_(4)]^(-2)`
`[Ni(CO)_(4)]`
`[Cu(NH_(3))_(4)]^(+2)`

The water -soluble complex among the following is (a) [Ni(HDMG)_(2)] (b) [Co(NH_(3))_(3)CI_(3)] (c ) Ni(CO)_(4) [Ni(HDMG)_(2)]CI_(2) .

The correct statement on the isomerism associated with the following complex ions. I [Ni(H_(2)O)_(5) NH_(3)]^(2+) II . [Ni (H_(2) O)_(4) (NH_(3))_(2)]^(2+) III. [Ni(H_(2)O)_(3)(NH_(3))_(3)]^(2+)

What will be the correct order for the wavelengths of absorption in the visible region for the following: [Ni(NO_(2))_(6)]^(4-), [Ni(NH_(3))_(6)]^(2+), [Ni(H_(2)O)_(6)]^(2+) ?

How many complexes among the following are paramagnetic [Mn(CN)_(6)]^(3-)[Cr(H_(2)O)_(6)]^(3+)[Co(en)_(3)]^(3+) [V(CO)_(6)],[Ni(NH_(3))_(6)]^(2+)[Ni(dmg)_(3)] [Pt(Cl)_(2)(NH_(3))_(2)][Cu(NH_(3))_(4)]^(2+)[Cu(CN)_(4)]^(3-)

Indicate the oxidation state of the central metal ion in each of the following complex (a) [Cu(NH_(3))_(4)]^(2+) (b) [Cu(Br_(4))]^(2-) (c ) [Cu(CN)_(2)]^(Θ) (d) [Cu(NH_(3))_(4)CO_(3)]^(o+) (e) [PtCI_(4)]^(2-) (f) [Co(NH_(3))_(2)(NO_(2))_(4)]^(Θ) (g) Fe(CO)_(5)) (h) [ZnCI_(4)]^(2-) (i) [Fe(en)_(3)]^(2+) .

The magnetic moment of a complex ion is 2.83BM The complex ion is (a) [Cr(H_(2)O)_(6)]^(3+) (b) [Cu(CN)_(6)]^(2-) (c ) [V(H_(2)O)_(6)]^(3+) (d) [MnCI_(4)]^(2-) .

The magnetic moment of a complex ion is 2.83BM The complex ion is [Cr(H_(2))O)_(6)]^(3+) (b) [Cu(CN)_(6)]^(2-) (c ) [V(H_(2)O))_(6)]^(3+) (d) [MnCI_(4)]^(2-) .

Name of the following complex ions (a) [PdBr_(4)]^(2-) (b) [CuCl_(2)]^(o+) (c ) [Au(CN)_(4)]^(o+)(d) [AlF_(6)]^(3-) [Cr(NH_(3))_(6)]^(3-) (f) [Zn(NH_(3))_(4)]^(2+) (g) [Fe(CN)_(6)]^(3-) .

Calculate the EAN of central atom in the following complexes (a) [Cr(CO)_(6)]" "(b) [Fe(CN)_(6)]^(4-)" " (c ) [Fe(CO)_(5)] " " (d) [Co(NH_(3))_(6)]^(3+) (e ) [Ni(CO)_(4) " " (f) [Cu(CN)_(4)]^(3-)" "(g)[Pd(NH_(3))_(6)]^(4+)" " (h) [PtCl_(6)]^(2-)

Correct order of magnetic moment (spin only) for the following complexes (a) [Pd(PPh_(3))_(2)Cl_(2)] (b) [Ni(CO)_(4)] (c) [Ni(CN)_(4)]^(2-) (d) [Ni(H_(2)O)_(6)]^(2+)