Question

Carbon burns in oxygen gas to produce

• A. crackling sound
• B. blue flame
• C. white fumes
• D. white ash

Answer 1

The correct option is A

crackling sound

Explanation for correct option:

Option: (A) Crackling sound

• Carbon in the form of charcoal when burned in the presence of oxygen produces sparkles and crackling sounds with the evolution of a colourless gas called carbon dioxide.
• The balanced chemical reaction can be written as:

$\underset{\left(\mathrm{Carbon}\right)}{\mathrm{C}}+\underset{\left(\mathrm{Oxygen}\right)}{{\mathrm{CO}}_2}\stackrel{\mathrm{Crackling}\mathrm{sound}}{\to }\underset{(\mathrm{Carbon}\mathrm{dioxide})}{{\mathrm{CO}}_2}$

Explanation for incorrect options:

(B) Blue flame - Sulphur when reacted with oxygen gives off the blue flame.

(C) White fumes - Phosphorus when burned in presence of oxygen produces white fumes.

(D) White ash - Magnesium when burned in presence of oxygen produces white ash.

Hence, option (A) is correct.