Assertion (A): On adding dil. HCl to a test tube containing a substance ' $X$ ', a colourless gas is

Question

Assertion (A): On adding dil. HCl to a test tube containing a substance ' $X$ ', a colourless gas is produced which gives a pop sound when a burning match stick is brought near it.\ Reason (R): In this reaction metal ' $X$ ' is displaced by hydrogen.\

Professor PC Thomas Classes · Answer

(c): A is true but R is false.