P-Block Elements Ques 501

Question: Sulphur in +3 oxidation state is present in

[DCE 2003]

Options:

A) Sulphurous acid

B) Pyrosulphuric acid

C) Dithionous acid

D) Thiosulphuric acid

Show Answer

Answer:

Correct Answer: C

Solution:

Dithionous acid $ (H_2S_2O_4) $ has sulphur in +3 oxidation state. $ HO-\overset{O}{\mathop{\overset{||}{\mathop{S}}}}-\overset{O}{\mathop{\overset{||}{\mathop{S}}}}-OH $ ; $ 2(+1)+2x+4(-2)=0 $ $ 2x=8-2=6 $ ; $ \overset{+4}{\mathop{MnO_2}}+4HCl\to \overset{+2}{\mathop{MnCl_2}}+2H_2O+Cl_2 $



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