Please let me know the answer of question no.11.

Dear student,
Answer to question 11 is given below:
HCl gas gives thick white fumes of ammonium chloride when glass rod dipped in ammonia solution is held near the vapors of the acid. NH3 + HCl ⟶ NH4Cl
With silver nitrate HCl gives white precipitate of silver chloride. The precipitate is insoluble in nitric acid but soluble in ammonium hydroxide. AgNO3 + HCl ⟶ AgCl + HNO3
A greenish yellow gas is liberated when concentrated hydrochloric acid is heated with oxidizing agent like manganese dioxide.
MnO2+ 4HCl ⟶ MnCl2 + 2H2O + Cl2

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