Question

A metal X reacts with dilute hydrochloric acid to form a gas Y. When a lighted matchstick is brought closer, this gas burns by producing a 'pop' sound. Identify the possible metals that can fit as X and also the gas Y from the given options?

• A. X:- Magnesium, Y:- Water
• B. X:- Zinc, Y:- Hydrogen
• C. X:- Copper, Y:- Hydrogen
• D. X:- Calcium, Y:- Hydrogen

Answer 1

Answer: (B), (D)

The correct options are
B

X:- Zinc, Y:- Hydrogen

D

X:- Calcium, Y:- Hydrogen

Metal X + Acid $\to$ Salt of metal X + $H_2$

From the given options magnesium, zinc, and calcium are more reactive metals and react with dilute hydrochloric acid to produce hydrogen gas. Hydrogen gas released burns with a pop sound.

Copper does not react with dilute hydrochloric acid to produce salt and hydrogen gas.