When magnesium is burned in the air , a powdery ash X is formed. x on dissolving with water forms Y . What are Y and X

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(a) When a magnesium is burnt in air, magnesium oxide is formed. The equation for the reaction is given below.
Mg+O2→MgO

When magnesium oxide is dissolved in water, magnesium hydroxide is formed. The equation for the reaction is as follow:

MgO+H2O→Mg(OH)2

X is magnesium oxide(MgO) and Y is magnesium hydroxide(Mg(OH)2)

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