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  4. Some of alkali metal salts are coloured. Na 2 CrO 4 - yellow, KMnO 4 - pink, K 2 MnO 4- green. It is due to

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Q. Some of alkali metal salts are coloured. $Na _2 CrO _4 -$ yellow, $KMnO _4 - $ pink, $K _2 MnO _4-$ green. It is due to

The s-Block Elements

Solution:

Alkali salts are colourless
$NaCl$ colourless $Na _2 CrO _4$-yellow since $CrO _4^{3-}$ is yellow
$KCl$ colourless $K _2 CrO _4$ - yellow
$KMnO _4-$ pink since $MnO _4^{-}$is pink
$K _2 MnO _4-$ green since $MnO _4^{2-}$ is green