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. finf x and y. write a balance equation when x is dissolved in water

Answer 1

x=magnesium oxide
y=magnesium nitride
and if x in water magnesium hydroxide

Answer 2

A magnesium ribbon burn in oxygen to give a white compound

2Mg+O2--> 2Mgo
Compound x= Mgo(Magnesium oxide)
if it is placed in atmosphere of nitrogen
It will form

Compound Y= Mg3N2(magnesium nitride)

If Compound X is dissolved in water , the product will be Mg(OH)2

Hope it will help u
Mgo+H2O--> Mg(OH)2