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An element reacts with oxygen to form an...

An element reacts with oxygen to form an oxide which dissolves in dilute hydrochloric acid. The oxide formed also turns a solution of red litmus blue. Is the element a metal or a non-metal? Explain your answer.

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The oxide of the element is basic as it turns red litmus solution blue. This means that the element is a metal (M). Let the metal be sodium (Na). The chemical equations that are involved are given as follows :
`underset("Sodium")(4Na(s)) + O_(2)(g) rarr underset("Sodium oxide")(2Na_(2)O(s))`
`underset("Basic oxide")(Na_(2)O(s))+H_(2)O(l) rarr 2NaOH(aq)`
`Na_(2)O(s) + 2HCl(dil.)rarr 2NaCl(aq) + H_(2)O(aq)`
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