Question

Zinc granules are added to a test tube containing dilute hydrochloric acid. A burning splinter is brought near the mouth of the test tube after a while. Which of the following observations are observed?

• A. Zinc hydroxide 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 correct options are
B Zinc chloride is formed.
C Hydrogen gas is formed.
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 is formed. The reaction involved is:

$\mathrm{Zn}\left(s\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to {\mathrm{ZnCl}}_2\left(\mathrm{aq}\right)+H_2\left(g\right)$

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