Question

what is the colour change observe when metallic oxides are tested with red litmus paper​

Answer 1

Answer:

It turns into blue colour

I hope it is correct

Answer 2

When metal oxides react with acid they form respective metal salt and water. ... Hence it can be concluded that Metal oxide is a base. So Bases generally turn Red litmus to blue. Hence the solution of any metal oxide will turn Red litmus to Blue but it has no effect on the Blue Litmus paper.