How would you distinguish between dilute HCl and dilute $H N O_{3}$ , by addition of only one solution?

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Solution

By adding silver Nitrate $(A g N O_{3})$
solution
Silver Nitrate solution helps in distingishing dil.hydrochloric acid and dilute nitric acid,by following reactions:
Silver nitate solution will give a white ppt i.e.,AgCl when added to dil.hydrochloric acid.
$A g N O_{3} + H C l \to A g C l + H N O_{3}$
When silver Nitrate is added to dilute $H N O_{3}$ no change will be observed
$A g N O_{3} + H N O_{3} \to N o r e a c t i o n$

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