The oxide of a metal (R) can be reduced by the metal (P) and metal (R) can reduce the oxide of metal (Q). Then the decreasing order of the reactivity of metal (P), (Q) and (R) with oxygen is:

Question

Prashant Kotian · Accepted Answer

Correct answer: B. Step 1: Zinc blende is zinc sulfide (ZnS). Step 2: First, ZnS is concentrated by froth floatation and then roasted in the presence of excess air to convert it into zinc oxide (ZnO): 2ZnS + 3O2 -> 2ZnO + 2SO2. Subsequently, ZnO is reduced to metallic zinc by heating it with coke (carbon) at a high temperature (around 1400°C): ZnO + C -> Zn + CO. Step 3: Therefore, the extraction is achieved by roasting followed by reduction with carbon, which corresponds to option (b).

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