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A white precipitate was formed when BaCl 2 was added to water extract of an inorganic salt. Further, a gas 'X' with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is

1. I –
2. – 2 3 SO
3. – 2 S
4. – 2 NO

Correct answer: – 2 3 SO

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