Identify the complexes which are expected to be coloured. Explain, (a) (i) [Ti(NO_(3))_(4)] (ii) [Cu(NC CH_(2))_(4)]^(+) BF_(4)^(-) (iii) [Cr(NH_(3))_(6)]^(3+)3Cl, (iv) K_(3)[VF_(6)] (b) Complete and balance the following reactions. (i) [MnO_(4)]^(2-) + H^(+) to ............... + [MnO_(4)]^(-) + H_(2)O (ii) Ca_(5)(PO_(4))_(2)F + H_(2)SO_(4) + H_(2)O overset("heat")to............... + 5CaSO_(4).2H_(2)O + ............. (iii) SO_(2)(aq) + CrO_(7)^(2-) + 2H^(+) to ............... + ........... +........... (iv) Sn + 2KOH + 4H_(2)O to.......... + .......... (c ) Give reasons for the following: Although aluminium is above hydrogen in the electrochemical series, it is stable in air and water.

Identify the complexes which are expected to be coloured. Explain, (a

1.	Identify the complexes which are expected to be coloured. Explain, (a) (i) [Ti(NO_(3))_(4)] (ii) [Cu(NC CH_(2))_(4)]^(+) BF_(4)^(-) (iii) [Cr(NH_(3))_(6)]^(3+)3Cl, (iv) K_(3)[VF_(6)] (b) Complete and balance the following reactions. (i) [MnO_(4)]^(2-) + H^(+) to ............... + [MnO_(4)]^(-) + H_(2)O (ii) Ca_(5)(PO_(4))_(2)F + H_(2)SO_(4) + H_(2)O overset("heat")to............... + 5CaSO_(4).2H_(2)O + ............. (iii) SO_(2)(aq) + CrO_(7)^(2-) + 2H^(+) to ............... + ........... +........... (iv) Sn + 2KOH + 4H_(2)O to.......... + .......... (c ) Give reasons for the following: Although aluminium is above hydrogen in the electrochemical series, it is stable in air and water.
Answer» Solution :(a) (iii) (b) (i) `3MnO_(4)^(2-) + 4H^(-) to MnO_(2) + 2MnO_(4)^(-) + 2H_(2)O` (b) (i) `3MnO_(4)^(2-) + 4H^(-) to MnO_(2) + 2MnO_(4)^(-) + 2H_(2)O` (II) `Ca_(5)(PO_(4))_(2)F+H_(2)SO_(4) + H_(2)O overset("heat")to H_(3)PO_(4) + 5CaSO_(4).2H_(2)O + HF` (iii) `SO_(2)(aq) + CrO_(7)^(2) + 2H^(+) to SO_(4)^(2-) + 2Cr^(3+) + H_(2)O` (IV) `SN + 2KOH + 4H_(2)O to K_(2)[Sn(OH)_(6)] + 2H_(2)` (c ) Due to formation of oxide layer.