pBlock ElementsII 1 Question 80
75. Identify the compounds $A, B, C, D$
$$ \mathrm{Na}{2} \mathrm{CO}{3} \xrightarrow{\mathrm{SO}{2}} A \xrightarrow{\mathrm{Na}{2} \mathrm{CO}{3}} B \xrightarrow[\Delta]{\text { Elemental } \mathrm{S}} C \xrightarrow{\mathrm{I}{2}} D $$
and give oxidation state of sulphur in each compounds.
$(2003,4 \mathrm{M})$
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Solution:
- $A=\stackrel{+4}{\mathrm{NaH} \mathrm{S}} \mathrm{O}{3} ; B=\stackrel{+4}{\mathrm{Na}{2}} \stackrel{4}{\mathrm{~S}}{3} ; C=\stackrel{+2}{\mathrm{Na}{2}} \stackrel{+2}{\mathrm{~S}{2}} \mathrm{O}{3} ; D=\stackrel{+2.5}{\mathrm{Na}{2}}{ }{\mathrm{S}}^{4} \mathrm{O}_{6}$
