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Characteristics of s- Block Elements

What are colo...

Question

What are coloured compounds?

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Solution

Transition metals form coloured compounds and complexes. These colours may vary depending on the charge on the metal ions and the number and type of group of atoms (called as ligands) attached to the metal ions. In aqueous solutions, ions form complexes with different colours as shown below

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Q. What is annealing of glass? Name the colour obtained when (i) Ferric compounds, (ii) Cobalt compounds are added to the mixture of molten glass.

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Q. Why are the compounds of transition metal generally coloured ?

F e C l_{3}

is treated with

K_{4} [F e (C N)_{6}]

, a blue coloured compound is formed. What are the total number of atoms per formula molecule? (supposing no K is present in blue coloured compound)

C u {S O}_{4} \cdot 5 H_{2} O

F e {S O}_{4} \cdot 7 H_{2} O

are blue and green colour compounds respectively. Reason: Both compounds have their specific colour due to phenomenon of polarisation of anion.

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Characteristics of s- Block Elements

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