Question

When magnesium is burnt in air, a powdery ash X is formed. X on dissolving in water forms Y.

a) what are X and Y
b) what is the action of Y on litmus paper.

Answer 1

hola user !

Here's your answer :

________________________

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

b) The solution ie magnesium hydroxide does not affect blue litmus but turns red litmus blue. 

_________________________

Thank you ! Doubts are most welcome :)