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Which one of the following is not an example of calcination?

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Which one of the following is not an example of calcination?

(1) Fe2O3.xH2O \(\xrightarrow{Δ}\) Fe2O3+xH2O

(2) CaCO3 \(\xrightarrow{Δ}\) CaO + CO2

(3) CaCO3 . MgCO3  \(\xrightarrow{Δ}\) CaO + mgO + 2CO2

(4) 2Pbs + 3O2  \(\xrightarrow{Δ}\) 2PbO + 2SO2

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(4) 2Pbs + 3O2  \(\xrightarrow{Δ}\) 2PbO + 2SO2

It is a roasting reaction.

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