Question

On burning magnesium ribbon in a jar of carbon dioxide,particles start to deposit on the walls of the jar.

• A. carbon
• B. oxygen
• C. magnesium
• D. carbon

Answer 1

The correct option is A carbon

On burning magnesium ribbon in a jar of carbon dioxide, black carbon particles start to deposit on the walls of the jar because magnesium needs oxygen for burning. So, the black carbon particles are deposited due to incomplete combustion of the magnesium ribbon. The reaction involved is as follows:
${\mathrm{CO}}_2+2\mathrm{Mg}\stackrel{\Delta }{\to }2\mathrm{MgO}+C$