alleryHNO₃–water mixture forms a *maximum* boiling azeotrope at composition:
A68% HNO₃, 32% water
B50% HNO₃, 50% water
C95% HNO₃, 5% water
D32% HNO₃, 68% water
Answer & Solution
Correct answer: A. 68% HNO₃, 32% water
HNO₃–water shows large negative deviation
→ **maximum-boiling azeotrope at ~68% HNO₃ by mass**, with boiling point 393.5 K. That's why concentrated nitric acid is 68%.
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