When an inorganic compound reacts with SO_2 i | vedclass

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Question

(D) The reaction sequence is as follows:$1$. An inorganic compound (like $Ca(OH)_2$) reacts with $SO_2$ to form $(A)$ $(CaSO_3)$.$2$. $(A)$ $(CaSO_3)$

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$Na_2S_2O_3$

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(D) The reaction sequence is as follows:$1$. An inorganic compound (like $Ca(OH)_2$) reacts with $SO_2$ to form $(A)$ $(CaSO_3)$.$2$. $(A)$ $(CaSO_3)$ reacts with $Na_2CO_3$ to give $(B)$ $(Na_2SO_3)$.$3$. Alternatively,the standard industrial process for preparing sodium thiosulphate involves: $2NaOH + SO_2 \rightarrow Na_2SO_3 + H_2O$.$4$. Then,$Na_2SO_3 + S \rightarrow Na_2S_2O_3$ (Compound $(C)$).$5$. $Na_2S_2O_3$ (Sodium thiosulphate) is widely used in photography as a fixing agent (hypo solution).

When an inorganic compound reacts with $SO_2$ in an aqueous medium,it produces $(A)$. $(A)$ on reaction with $Na_2CO_3$ gives compound $(B)$,which with sulphur,gives a substance $(C)$ used in photography. Compound $(C)$ is:

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