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Chemistry-

General

Easy

Question

Some of alkali metal salts are coloured. $N a subscript 2 end subscript C r O subscript 4 end subscript minus$ yellow, $K M n O subscript 4 end subscript minus$ pink, $K subscript 2 end subscript M n O subscript 4 end subscript minus$ green. It is due to

Cations are coloured ions
Anions are coloured ions
Both (a) & (b) are correct
None of the above is correct

The correct answer is: Anions are coloured ions

Alkali salts are colourless
$N a C l$ colourless $N a subscript 2 end subscript C r O subscript 4 end subscript minus$ yellow since $C r O subscript 4 end subscript superscript 3 minus end superscript$ is yellow
$K C l$ colourless $K subscript 2 end subscript C r O subscript 4 end subscript minus$ yellow
$K M n O subscript 4 end subscript minus$ pink since $M n O subscript 4 end subscript superscript minus end superscript$ is pink
$K subscript 2 end subscript M n O subscript 4 end subscript minus$ green since $M n O subscript 4 end subscript superscript 2 minus end superscript$ is green

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