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Q.

Find the number of following reactions which are involved in roasting process: S8+8O2⟶Δ8SO2↑P4+5O2→ΔP4O10↑4As+3O2⟶Δ2As2O3↑ZnCO3⟶Δ4ZnO+CO2↑

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answer is 4.

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Detailed Solution

Roasting is heating the ore in presence of  O2. . Reactions (i), (ii), (iii)  and   (iv)   can be termed roasting
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Find the number of following reactions which are involved in roasting process: S8+8O2⟶Δ8SO2↑P4+5O2→ΔP4O10↑4As+3O2⟶Δ2As2O3↑ZnCO3⟶Δ4ZnO+CO2↑