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What is the nitric acid – water composition by mass, respectively, for the components to form an azeotrope?(a) 70% – 30%(b) 68% – 32%(c) 30% – 70%(d) 32% – 68%I have been asked this question during an interview for a job.The above asked question is from P-Block Elements in section P-Block Elements of Chemistry – Class 12

Answer»

The correct answer is (b) 68% – 32%

Best explanation: Experimentally, it is determined that nitric acid and water form a constant BOILING azeotrope at 68% – 32% by mass composition, RESPECTIVELY. Here, it BECOMES impossible to separate water and nitric acid by DISTILLATION methods. Thus, concentrated sulfuric acid is used for dehydration and removal of water.



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