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  4. When HNO3 is dropped into the palm and washed with water, it turns into yellow. It shows the presence of

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Q. When $HNO_3$ is dropped into the palm and washed with water, it turns into yellow. It shows the presence of

The p-Block Elements - Part2

Solution:

Nitric acid turns the skin yellow. because it reacts with protein giving a yellow compound called xanthoprotein.