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Elements P, Q, R and S belong to the same group in periodic table. The oxide of P is acidic, oxide of Q and R are amphoteric while the oxide of S is basic. The most electropositive element among them is
The more electropositive (metallic) an element is, the more basic its oxide. Since the oxide of S is basic while the others are acidic or amphoteric, S is the most electropositive element.
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