An oxide of an element A when treated with an acid formed a solution which was neutral to litmus. Is A a metal or a non-metal? What is the nature of the oxide?

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Solution

If a resulting solution is neutral to the litmus, it indicates that it is a salt solution. A salt is obtained by reaction of an acid with base.
Therefore, the oxide of the element A is basic in nature.
The oxides of metals are basic in nature.
So the given element A is a metal.
Metal + oxygen $\to$ (metal oxides) Basic $\overset{acid}{\to}$ neutral solution

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An element forms an oxide

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