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Question
Oxidation state of sulphur in anions `"SO"_3^(2-)`, `"S"_2"O"_4^(2-)` and `"S"_2"O"_6^(2-)` increases in the orders:
Options
`"S"_2"O"_6^(2-) < "S"_2"O"_4^(2-) < "SO"_3^(2-)`
`"SO"_3^(2-) < "S"_2"O"_4^(2-) < "S"_2"O"_6^(2-)`
`"S"_2"O"_4^(2-) < "SO"_3^(2-) < "S"_2"O"_6^(2-)`
`"S"_2"O"_4^(2-) < "S"_2"O"_6^(2-) < "SO"_3^(2-)`
MCQ
Solution
`bb("S"_2"O"_4^(2-) < "SO"_3^(2-) < "S"_2"O"_6^(2-))`
Explanation:
In `"SO"_3^(2-)`
x + 3(−2) = −2; x = +4
In `"S"_2"O"_4^(2-)`
2x + 4(−2) = −2
2x = 6; x = +3
In `"S"_2"O"_6^(2-)`
2x + 6(−2) = −2
2x = 10; x = + 5
Hence the correct order is `"S"_2"O"_4^(2-) < "SO"_3^(2-) < "S"_2"O"_6^(2-)`.
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Oxidation Number - Introduction
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