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A black mineral (A) on heating in presen...

A black mineral (A) on heating in presence of air gives a gas (B). The mineral (A) on reaction with dilute `H_(2)SO_(4)` gives a gas (C) and a solution of a compound (D) on passing the gas (C) into an aqueous solution of (B), a white turbidity is obtained. The aqueous solution of (D) on reaction with potassium ferricyanide gives a blue compound (E). Identify (A) to (E) and give chemical equations for the reaction involved.

Text Solution

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`ArarrFeS`
`B rarr SO_(2)`
`C rarr H_(2)S`
`D rarr FeSO_(4)`
`E rarr KFe [Fe(CN)_(6)]`
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