A) Reducing \[N{{a}_{2}}S{{O}_{4}}\] solution with \[{{H}_{2}}S\]
B) Boiling \[N{{a}_{2}}S{{O}_{3}}\] solution with \[S\] in alkaline medium
C) Neutralising \[{{H}_{2}}{{S}_{2}}{{O}_{3}}\] solution with \[NaOH\]
D) Boiling \[N{{a}_{2}}S{{O}_{3}}\] solution with \[S\] in acidic medium
Correct Answer: B
Solution :
\[N{{a}_{2}}S{{O}_{3}}+S\xrightarrow{NaOH}\underset{\text{Sod}\text{. thiosulphate}}{\mathop{N{{a}_{2}}{{S}_{2}}{{O}_{3}}}}\,\]
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