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JEE Main levelSingle correct optionDifficulty 2 of 3bn131

What is the AVERAGE oxidation number of S in the tetrathionate ion $S X_{4} O X_{6} X^{2 -}$ (O is $- 2$ )?

A $+ 2.5$
B $+ 2$
C $+ 3$
D $+ 5$

Answer: A

4 x + 6 (- 2) = - 2

, so

4 x = 10

and the average

x = + 2.5

.

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