Riya and her friends went to Rameshwaram on school trip, when they went to the beach one of her friends drank the sea water as she considered it to be holy water. She started vomiting immediately. Give reason for this observation.
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In the jeweler’s shop, to polish gold jewelry it is dipped in an acid called Aqua Regia.
Aqua Regia dissolves the outer layer of gold.
So, the inner shiny layer is visible.
As there is a loss of the outer layer there is a slight loss in its weight
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