NEET 2017 Chemistry question

In which pair of ions both the species contain S - S bond?

(1)
(2)Correct
(3)
(4)

Answer: (2)

Solution

Tetrathionate , , has an S-S-S-S chain (three S-S bonds), and thiosulphate , , has one S-S bond (a sulphur atom replacing an oxygen of sulphate). Pyrosulphate

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Question ID VK-092079