[Roorkee 1999]
A) $ Na_2S_2O_3+NaHSO_3 $
B) $ Na_2S_2O_3+Na_2S $
C) $ Na_2SO_3 $ $ +H_2S $
D) $ Na_2SO_3+SO_2 $
Correct Answer: B
$ 3S+4NaOH\xrightarrow{boiling}Na_2S_2O_3+Na_2S $
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