1.

Give reasons:The reaction temperature is maintained below 200°C.

Answer»

The reaction temperature is maintained below 200°C. This is because at higher temperatures, HNO3 decomposes to give NO2 . The brown coloured NO2 dissolves in HNO3 to give it a yellow colour. Thus, if the temperature is allowed to go beyond 200°C, the product (HNO3) obtained is not pure (colourless). 



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