pBlock ElementsII - Result Question 118

####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:

  1. $S-S$ 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.



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