Which of the following is NOT calcination?

F e (O H)_{3} . x H_{2} O \to F e_{2} O_{3} + H_{2} O

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C u C O_{3} . C u (O H)_{2} \to^{2} C u O + C O_{2} + H_{2} O

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

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(N H_{4})_{2} C O_{3} \to^{2} N H_{3} + C O_{2} + H_{2} O

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Solution

The correct option is D $(N H_{4})_{2} C O_{3} \to^{2} N H_{3} + C O_{2} + H_{2} O$
Calcination is a process of heating to high temperature in air or oxygen, however calcination is also used to mean a thermal treatment process in the absence or limited supply of air or oxygen.
$(N H_{4})_{2} C O_{3}$ is not an ore.so, it do not undergo calcination.

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