Question

When zinc granules are added to a test tube containing dilute hydrochloric acid then:

• A. Oxygen gas is formed
• B. Zinc chloride is formed
• C. Hydrogen gas is formed
• D. The evolved gas burns with a pop sound

Answer 1

Answer: (B), (C), (D)

The evolved gas burns with a pop sound

Metals react with acids to form respective metal salts and hydrogen gas.
When zinc granules are added to dilute hydrochloric acid, zinc chloride and hydrogen gas are formed. This can be represented as:

$\text{Zinc + Hydrochloric acid}\to \text{Zinc chloride + Hydrogen}$

The evolved hydrogen gas burns with a pop sound when a burning splinter is brought close to the mouth of the test tube. This is because hydrogen gas is highly inflammable.