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An element occupies group No.16 and peri...

An element occupies group No.16 and period number 2. This element on passing through silence electric discharge forms (A). (A) also reacts with lead sulphide and forms (B). (A) also reacts with `BaO_(2)` and forms (C). It reacts with `H_(2)O_(2)` and forms (D). Identify the dement (A), (B), (C) and (D).

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