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Question
What happens when nitric acid is added to egg shell?
Solution
Egg shell contains calcium carbonate as its main constituent. When dipped in concentrated nitric acid, calcium carbonate reacts to evolve carbon dioxide. As a result, egg shell slowly dissolves.
`"CaCO"_3 + 2"HNO"_3 ("Conc".) -> "Ca"("NO"_3)_2 + "H"_2"O" + "CO"_2`
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