A substance X reacts with Y to evolve a gas Z. Z produces a pop sound when a burning matchstick is brought near it. On the other hand, Y is a neutral liquid.
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When a metal reacts with hydrochloric acid, it produces a gas Y which produces a pop sound. This sound is produced by hydrogen gas. When the same metal is reacted with a base like sodium hydroxide, on heating it produces the same gas. Zinc metal reacts with both acid and base (on heating) and it produces hydrogen gas
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