Question

A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emissions of light.If the burning ribbon is now placed in an atmosphere of nitrogen,it continues to burn and form 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 1

1)
2Mg + O₂  ---> 2MgO
Compound X ==> MgO  [ Magnesium Oxide ]

Compound Y ==> Mg₃N₂  [ Magnesium Nitride ]

if "X" , that is , Magnesium Oxide is dissolved in water , the product is Magnesium Hydroxide 

MgO  + H₂O ---> Mg(OH)₂

This equation is already balanced !!

Answer 2

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answer:

magnesium ribbon is burnt with O2 forms magnesium oxide.

2Mg+O2 →→→→→(heated) 2MgO+ energy.

(i)

x=MgO

y=Mg3N2

(ii)

if it is dissolved in water it forms magnesium hydroxide

Mgo+H2O→→→→→Mo(OH)2