Calculate the oxidation number of each sulphur atom in the following compounds:
(a) Na_{2}S_{2}O_{3}
(b) Na_{2}S_{4}O_{6}
(c) Na_{2}SO_{3}
(c) Na_{2}SO_{4}

Answers (1)

(a) Consider oxidation number of sulphur atom x.

 

2 \times (+1) + 2x + (-2) \times 3 = 0

2 + 2x -6 = 0

2x -4 = 0

2x = 4

x = +2

 

(b) Na_{2}S_{4}O_{6}

2 \times (+1) + 2x + (-2) \times 6 = 0

2 + 2x -12 = 0

2x -10 = 0

X = +5

 

(c) Na_{2}SO_{3}

2 \times (+1) + x + (-2) X = 0

2 + x - 6 = 0

x = +4

 

(d) Na_{2}SO_{4}

2 \times (+1) + x + (-2) \times 4 = 0

2 + x - 8 = 0

x = +6

 

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