Which of the following reaction(s) occur during calcination?

C a C O_{3} \to C a O + C O_{2}

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4 F e S_{2} + 11 O_{2} \to 2 F e_{2} O_{3} + 8 S O_{2}

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2 A l (O H)_{3} \to A l_{2} O_{3} + 3 H_{2} O

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C u S + C u S O_{4} \to 2 C u + 2 S O_{2}

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Solution

The correct option is C $2 A l (O H)_{3} \to A l_{2} O_{3} + 3 H_{2} O$
Calcination is process of converting an ore into its oxide by heating it either in a limited supply or in the absence of air.

Roasting is the process of heating sulphide ores in the presence of oxygen.

Reactions in (a) and (c) represent calcination process, whereas (b) is roasting as reduction is done by heating in presence of $O_{2}$ and (d) is auto-reduction process.

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Similar questions

C a C O_{3} \to C a O + C O_{2}

4 F e S_{2} + 11 O_{2} \to 2 F e_{2} O_{3} + 8 S O_{2}

2 A l (O H)_{3} \to A l_{2} O_{3} + 3 H_{2} O

C u_{2} S + 2 C u O \to 4 C u + S O_{2}

Which of the following reactions could be termed as calcination?

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