Question

observe the figure and identify the substances marked p ,q and r

Answer 1

here there,

We know that that hydrogen gas evolve with a pop sound hence the answer should be d

and for a conformation i want to mention the reaction too i.e

              Zn + 2HCl = ZnCl2 + H2.
 

Answer 2

Hay friend!☺

P=Zinc
q=Hydrochloric acid
r=Hydrogen

Hope it helps you!