A pale yellow solid molecule (A) having crown | vedclass

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Question

(B) The pale yellow solid molecule $(A)$ with a crown shape is sulfur $(S_8)$.When $S_8$ is heated with concentrated $H_2SO_4$,it undergoes oxidation

Vedclass · Accepted Answer

$SO_2$

Vedclass · Answer

(B) The pale yellow solid molecule $(A)$ with a crown shape is sulfur $(S_8)$.When $S_8$ is heated with concentrated $H_2SO_4$,it undergoes oxidation to produce sulfur dioxide gas $(SO_2)$:$S_8 + 16H_2SO_4 \rightarrow 8SO_2 + 8SO_2 + 16H_2O$ (simplified as $S + 2H_2SO_4 \rightarrow 3SO_2 + 2H_2O$).$SO_2$ is a colorless gas with a suffocating smell.When $SO_2$ is passed through starch iodate paper,it reduces iodate $(IO_3^-)$ to iodine $(I_2)$,which reacts with starch to form a blue-colored complex.Therefore,the gas $(B)$ is $SO_2$.

$A$ pale yellow solid molecule $(A)$ having crown shape is heated with conc. $H_2SO_4$. It gives a suffocating smell of gas $(B)$,which when passed through starch iodate paper,turns it blue. The gas $(B)$ is:

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