Question

the following change is observed on dipping a litmus paper in aqueous solution of MgO.
a.red litmus turns blue,therefore MgO is alkaline.
b. blue litmus turns red,therefore MgO is acidic.
c.no c olour change in litmus paper,therefore MgO is neutral.
d.litmus paper is decolourised,therefore MgO acts as as bleaching agent.

Answer 1

Assuming that the MgO has some solubility associated with it. The O2- ion will accept a proton from a water molecule to produce OH-. Therefore, now having some basicity associated with the solution, providing red litmus paper is added to the solution it will change to a blue colour. (Note:- An initial piece of blue litmus would not change its colour.)
(a) is the right answer
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