Chemistry · S and p Block Elements
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When HNO3 is dropped into the palm and washed with water it turns into yellow. T shows the presence of:
- A
NO2
- B
N2O
- C
NO
- D
N2O5
When HNO3 is dropped on the palm and then washed with the water and it turns into yellow colour, it is because in the skin or any body part, protein is present.
When the HNO3 reacts with any protein, which in this case the hand which is keratinised so the protein which is present and it gives a yellow colour compound which is called xanthoprotein. Which contains N2O5.
NO2 is a nitrogen dioxide molecule, which is a brown gas and does not directly relate to the xanthoproteic reaction.
N2O, known as nitrous oxide or laughing gas, is not involved in the xanthoproteic reaction that turns the skin yellow.
NO is nitric oxide, a colorless gas that does not cause the yellow coloration observed in the xanthoproteic reaction.
N2O5 is involved in the formation of a yellow compound during the xanthoproteic reaction, indicating the presence of proteins.
Tagged under Chemistry · S and p Block Elements · 2013