Which of the following will be required to identify the gas evolved when dilute hydrochloric acid reacts with zinc metal?
(a) Red litmus paper
(b) pH paper
(c) Lime water
(d) A burning splinter

Correct Answer: (d) A burning splinter

Explanation: HCl, zinc metal forms zinc chloride, and hydrogen gas is evolved. Presence of hydrogen gas can be checked by a burning splinter because H4 gas burnt in a splinter with a pop sound.

"NCERT