A magnesium ribbon is burnt in oxygen

Question:

A magnesium ribbon is burnt in oxygen to give a white compound ‘X’ accompanied by emission of light. If the burning ribbon is now placed in an

atmosphere of nitrogen, it continues to burn and forms a compound ‘Y’.

(a) Write the chemical formulae of X and Y.

(b) Write a balanced chemical equations when X and Y are dissolved in water.

Solution:

(a) The Compound ‘X’ is magnesium oxide (MgO). The compound ‘Y’ is magnesium nitride (Mg3N2)

(b)

$\mathrm{MgO}(s)+\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{Mg}(\mathrm{OH})_{2}(s)$

(X)

$\mathrm{Mg}_{3} \mathrm{~N}_{2}(s)+6 \mathrm{H}_{2} \mathrm{O}(t) \longrightarrow 3 \mathrm{Mg}(\mathrm{OH})_{2}(s)+2 \mathrm{NH}_{3}(g)$

(Y)

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