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 equation, when X is dissolved in water.

Answer:

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

2Mg + O2 → 2MgO

3Mg + N2 → Mg3N2

The chemical formulae of X and Y are

Compound X→ MgO [Magnesium Oxide]

Compound Y →Mg₃N₂ [Magnesium Nitride]

If Magnesium Oxide is dissolved in water, the product is Magnesium Hydroxide

MgO + H2O → Mg(OH)2

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