The colour of a complex compound is due to .

The red colour of compound (B) is due to the formation of:

The red colour of compound (B) is due to the formation of:

The deep green colour of compound (C ) is due to the formation of:

The deep blue colour of compound (D) is due to the formation of:

No single theory of bonding of complex compound is sufficient to describe the bonding, magnetic property, colour, etc of a given complex. The tetrahedral complex which is diamagnetic but coloured.

In the Lassaigne's test for the detection of nitrogen in an compound, the appearance of blue coloured compound is due to-

In the Lassaigne's test for the detection of nitrogen in an organic compound, the appearance of blue coloured compound is due to