Question

When magnesium is burnt in the air, a powdery ash X is farmed. X on dissolving in water forms Y, what conclusion do you get about the nature of Y from its action on litmus paper?

Answer 1

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i) The X is magnesium oxide and the Y is magnesium hydroxide.

• When the magnesium burns into air, an oxidation reaction takes place and the atmospheric oxygen combines with the magnesium in order to form magnesium oxide. (Magnesium oxide is powdery)

2Mg + 02 ---> 2MgO

Now,when the magnesium oxide reacts with water,it forms magnesium hydroxide.

MgO + H2O ----> Mg(OH)2

ii) The Y or magnesium hydroxide turns the red litmus paper into blue litmus paper.

Answer 2

Explanation:

• i) X is magnesium oxide and Y is magnesium hydroxide

when the magnesium burns, it turns into red color.