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Question

Pure nitric acid is unstable to heat or sunlight.


A

True

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B

False

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Solution

The correct option is A

True


Pure nitric acid is unstable to heat or sunlight. It decomposes to give yellow solution due to the formation of nitrogen dioxide. Thus, 100% nitric acid is not generally used.

4HNO3Δ−−−−Sunlight4NO2+2H2+O2

In the presence of sunlight, nitric acid decomposes even at room temperature. The nitric acid stored in a bottle turns yellow. This colour is due to dissolved NO2 in HNO3. To avoid the decomposition, nitric acid is normally stored in coloured bottles.


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