Question

Some metals like magnesium, ribbon, aluminium foil, copper, wire and charcoal (powder) were taken in different test tubes labelled as P, Q, R and S. 5 mL of dilute hydrochloric acid was added to each test tubes. When a burning matchstick is brought near the mouth of each test tube, in which cases pop sound would be heard

Answer 1

Answer:

p,q,r

Explanation:

as metal react with acid to give salt and hydrogen gas and when a burning matchstick is brought near to the hydrogen gas a pop up sound will be heard