Question

Burning magnesium ribbon is brought in the gas jar of carbon dioxide. Which of the following is correct?
i.It keeps on burning
ii.It gets extinguished
iii.Although $$C{O}_2$$ is non-supporter of combustion burning magnesium breaks $$C{O}_2$$ into carbon and oxygen helps in burning
iv.Carbon dioxide is the supporter of combustion
A.(i) and (iv)
B.(i) and (iii)
C.(i) and (ii)
D.(iii) and (iv)

Answer 1

Hint: We must remember that the magnesium ribbon is a metallic element with a symbol of Mg having atomic number of 12 and which is a hard metallic element with silvery-white colour and which burns as a brilliant white flame. Magnesium ribbon obtained from the ore of magnesite, dolomite and from the salt water.

Complete step by step solution:
When we burn the magnesium ribbon it is brought into the gas jar of carbon dioxide, it keeps on burning. In this reaction, the magnesium atoms combine with oxygen in the carbon dioxide to form magnesium oxide, leaving behind the carbon as a black soot and releasing more energy.
We have to remember that the $$C{O}_2$$ is a fire extinguisher, but magnesium breaks $$C{O}_2$$ and start exothermic reaction, and it breaks $$C{O}_2$$ into magnesium oxide and carbon.
Now we can write the chemical reaction for this reaction as,
$$2M{g}_{\left(s\right)}+C{O}_2\to 2Mg{O}_{\left(s\right)}+C_{\left(s\right)}$$
We have to remember that this reaction is a thermodynamically favorable reaction, extremely exothermic. The exothermic reaction of burning magnesium with $$C{O}_2$$ to form magnesium oxide releases energy more and more, so the burning ribbon keeps on burning.
Therefore, the option B is correct.

Note: We have to remember that the magnesium filament was used in photography flashbulbs. In fireworks and marine flare fields magnesium powder is used to give a brilliant white light. In the theatrical field, which is used for lightning and supernatural appearances.
When magnesium reacts with the moisture which evolves hydrogen gas which is highly dangerous. The dust or flakes form of magnesium ribbon is very dangerous and when exposed to flame or by violent chemical reaction with oxidizing agents.