Question

a pop sound is produced when a matchstick is brought near the mouth of test-tube containing HCI and magnesium, aluminum and iron. No such pop sound is produced when the burning matchstick is brought near the mouth of test-tube containing charcoal or Sulphur powder with HCI why

Answer 1

Answer:

The pop sound is so produced indicate the evolution/formation of H2 (Hydrogen Gas).

Al, Mg or Fe they can displace H from HCl to from respective Chlorides (AlCl3, MgCl2, FeCl3)

So H displaced form H2 and as it is a gas so rise up, and if matchstick brought near it produces pop sound.

But its not the case with charcoal (Carbon) or sulphur, they cant do the same so no H2 produced, so no pop sound.

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Answer 2

A pop sound is produced when the burning matchstick is brought near the mouth of the test tube containing HCI and magnesium, aluminium and iron but, this does not occur with charcoal or Sulphur powder with HCI because-

• When metals such as magnesium, aluminium and iron are reacted with hydrochloric acid, a salt is formed with the evolution of gas. This gas is hydrogen gas that burns with a pop sound and blue flame when burning matchstick is brought near the mouth of test tubes containing metal and acid.
• Non-metals such as charcoal and sulphur powder do not react with dilute acids such as dil. hydrochloric acid. Hence, due to no chemical reaction, hydrogen gas is not evolved and no pop sound is produced.