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JAMB Chemistry 2019 Paper

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Question : 9

Total: 80

Burning magnesium ribbon in air removes which of the following

(i) oxygen (ii) nitrogen (iii) argon and (iv) carbon(iv)oxide?

i and iv only
i, ii, iii and iv only
i only
i and ii only

Solution:

Concept:

Burning magnesium reacts with oxygen and nitrogen in air to form oxides/nitrides.

Explanation:

Magnesium reacts with oxygen:

2\mathrm{Mg} + \mathrm{O}_2 \to 2\mathrm{MgO}

It also reacts with nitrogen:

3\mathrm{Mg} + \mathrm{N}_2 \to \mathrm{Mg}_3\mathrm{N}_2

Argon is inert, and carbon(IV) oxide is not removed in the normal burning of magnesium in air.

Answer:

D. i and ii only

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