A) \[2C{{u}_{2}}S+3{{O}_{2}}\xrightarrow[{}]{\Delta }2C{{u}_{2}}O+2S{{O}_{2}}\]
B) \[F{{e}_{2}}{{O}_{3}}.x{{H}_{2}}O\xrightarrow[{}]{\Delta }F{{e}_{2}}{{O}_{3}}+x{{H}_{2}}O\]
C) \[ZnC{{O}_{3}}\xrightarrow[{}]{\Delta }ZnO+C{{O}_{2}}\]
D) \[CaC{{O}_{3}}.MgC{{O}_{3}}\xrightarrow[{}]{\Delta }CaO+MgO+2C{{O}_{2}}\]
Correct Answer: A
Solution :
Calcination involves heating of the ore in absence of air. Thus, \[2C{{u}_{2}}S+3{{O}_{2}}\xrightarrow[{}]{\Delta }\]\[2C{{u}_{2}}O+2S{{O}_{2}}\uparrow \]this reaction involve roasting.
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