To which of the following ores, calcination process is not applicable?

C a C O_{3}

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A l_{2} O_{3} .2 H_{2} O

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C a C O_{3} . C a (O H)_{2}

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Z n S

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Solution

The correct option is D $Z n S$
$Z n S$ is roasted to get oxide.
$2 Z n S$ + $3 O_{2} \to 2 Z n O + 2 S O_{2}$

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