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Q.

Dilute HNO3 cannot be concentrated beyond 68% by boiling because

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a

On boiling HNO3 is decomposed

b

On boiling HNO3 produces a large amount of heat which is uncontrollable

c

It forms a constant boiling mixture with H2O boiling at 394K

d

It can be concentrated beyond 68% by steam distillation

answer is C.

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Detailed Solution

HNO3  forms azeotropic mixture at this percentage, every acid form azeotropic mixture at some percentage characteristic of its own
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