Why do HCl, HNO3 , etc., show acidic characters in aqueous solutions

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Why do HCl, HNO3 , etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

Answer: As aqueous solution, HCl and HNO3 dissociate into H+ and Hydronium (H3O+) ions. 

 HCl (aq) →  H+ + Cl- 
 H+ + H2O →  H3O+ 

Although glucose and alcohol contain hydrogen, as aqueous solution, they do not dissociate into ions and do not exhibit acidic character.

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