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In how many of the following sulphur exhibits either the least or the highest oxidation state possible for Sulphur. (average oxidation state only)
i) $N a_{2} S$ ii) $F e S_{2}$ iii) $ B a {(S O_{3})}_{2}$ iv) $N a_{2} S_{4} O_{6}$
v) ${(N H_{4})}_{2} S_{2} O_{8}$ vi) $F e_{2} {(S O_{4})}_{3}$ vii) $H_{2} S$ viii) $N a_{2} S_{2} O_{3}$

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answer is 4.

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Detailed Solution

Lowest OS for ‘S’ is (-2)
Highest OS for ‘S’ is +6

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