An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns blue litmus red. State whether element X is metal or a non-metal.

In the question the oxide of the element X, turns blue litmus red, upon dissolution in water, which implies that the oxide is acidic in nature. Non-metals generally form acidic oxides, therefore the element X should be a non-metal.

it is a non metal as non metallic oxides are acidic in nature and thus their solution turns blue litmus red

non metal