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Solution
The correct option is D4S+6NaOH⟶Na2S2O3+2Na2S+3H2OExcesssulphur−−−−−−−−−−−→Na2S5 Sulphur is boiled with caustic soda solution 4S+6NaOH⟶Na2S2O3+2Na2S+3H2OExcesssulphur−−−−−−−−−−−→Na2S5