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Why should the temperature of the reacti...

Why should the temperature of the reaction mixture of nitric acid not be allowed to rise above `200^@C`?

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Above `200^@`C, the nitric acid decomposes into sodium sulphate or potassium sulphate which forms a crust over the mixture thus, restricting the release of nitric acid vapours.
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ICSE-SAMPLE QUESTION PAPER 5-Section II
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