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Question

Some of alkali metal salts are coloured Na2CrO4 yellow, KMnO4 pink, K2MnO4 -green. It is due to:

A
cations are coloured ions
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B
anions are coloured ions
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C
both A and B
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D
none of the above
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Solution

The correct option is B anions are coloured ions

Alkali salts are colourless

NaCl colourless Na2CrO4 - yellow since CrO34 is yellow

KCl colourless K2CrO4 - yellow KMnO4 - pink since MnO4 is pink K2MnO4 - green since MnO24 is green

anion are colourful due to presence of unpaired electron.


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