Question

The red litmus paper turns blue when it is dipped into the solution of magnesium oxide with water. How?
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Answer 1

Answer:

Magnesium oxide changes the colour of red litmus paper to blue. This reaction shows that magnesium oxide is basic in nature. The formation of magnesium oxide is a direct combination reaction of two elements: magnesium and oxygen.

Explanation:

Answer 2

Magnesium forms magnesium oxide on burning in presence of air. It is a combination reaction between two elements. Magnesium oxide is basic in nature and thus its aqueous solution turns red litmus blue