Question

An oxide solution of which of the following elements will turn blue litmus red?

Answer 1

oxide of non metal element will turn blue litmus red. 

Answer 2

First of all lets understand what is meaning of oxide.
oxide means when an oxygen combines with any element its Oxide
second thing
OXIDES OF METALS ARE BASIC IN NATURE HENCE THEY WILL TURN RED LITMUS TO BLUE
OXIDES IF NON-METALS ARE ACIDIC IN NATURE HENCE THEY WILL TURN BLUE LITMUS RED

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