Sodium thiosulphate is formed when

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(D) Sodium thiosulphate $(Na_2S_2O_3)$ can be prepared by the following methods: $1$. Boiling a solution of sodium sulphite $(Na_2SO_3)$ with elementa

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Both $(B)$ and $(C)$

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(D) Sodium thiosulphate $(Na_2S_2O_3)$ can be prepared by the following methods: $1$. Boiling a solution of sodium sulphite $(Na_2SO_3)$ with elemental sulphur: $Na_2SO_3 + S \rightarrow Na_2S_2O_3$. $2$. Neutralisation of thiosulphuric acid $(H_2S_2O_3)$ with sodium hydroxide $(NaOH)$: $H_2S_2O_3 + 2NaOH \rightarrow Na_2S_2O_3 + 2H_2O$. Since both methods $(B)$ and $(C)$ produce sodium thiosulphate,the correct option is $(D)$.

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