pBlock ElementsII - Result Question 3
####3. The oxoacid of sulphur that does not contain bond between sulphur atoms is
(2019 Main 10 April I)
(a) $H _2 S _2 O _3$
(b) $H _2 S _2 O _4$
(c) $H _2 S _2 O _7$
(d) $H _2 S _4 O _6$
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Solution:
- $S-S$ bond is not present in $H _2 S _2 O _7$ (pyrosulphuric acid or oleum).
While the other given oxoacids of sulphur, i.e. $H _2 S _2 O _3$ (thiosulphuric acid), $H _2 S _2 O _4$ (hyposulphurous or dithionous acid) and $H _2 S _4 O _6$ (tetrathionic acid) contains $S-S$ bonds.
