Elements P, Q, R and S belong to the same group. The oxide of P is acidic, oxide of Q and R are amphoteric while the oxide of S is basic. Which of the following elements is the most electropositive?

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Solution

The correct option is D S
Along a period, acidic nature of oxide increases.
Down the group, basic nature of oxide increases and while electronegativity decreases.
S is most electropositive as metal oxides/hydroxide are basic and non-metal oxides/hydroxides are acidic.

$P \to A c i d i c (N o n m e t a l) Q \to A m p h o t e r i c R \to A m p h o t e r i c S \to B a s i c (M e t a l)$

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