Question

The following change is observed on dipping a litmus paper in aqueous solution of Mgo.
a. Red litmus paper turns blue, therefore MgO is alkaline.
b. Blue litmus paper turns red, therefore MgO is acidic.
c. No colour change in litmus paper, therefore MgO is neutral.
d. Litmus paper is decolourised, therefore MgO acts as bleaching agent.

Answer 1

Answer: The correct option is A.

Explanation: We are given an aqueous solution of MgO, the reaction follows:

$MgO(s)+H_2O(l)\rightarrow Mg(OH)_2(aq.)$

As we are getting $Mg(OH)_2$ in the solution, so the solution becomes alkaline in nature.

As basic solutions turn red litmus paper to blue, hence Option A will be the correct answer.

Answer 2

the correct answer is a] Red litmus paper turns blue, therefore MgO is alkaline.