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Which of the following is the type of reaction for the formation of gaseous PtO2 at 1200^oC or higher?

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Which of the following is the type of reaction for the formation of gaseous PtO2 at 1200^oC or higher?

(a) Exothermic reaction

(b) Endothermic reaction

(c) Both exothermic and endothermic reaction

(d) Neither exothermic nor endothermic reaction

This question was addressed to me during an interview.

I'm obligated to ask this question of Crystallization of Solutions, Melts, Glasses and Gels in section Preparative Methods of Solid State Chemistry

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The correct answer is (b) Endothermic reaction

Explanation: The formation of gaseous PtO2 at 1200^oC or higher is an endothermic reaction which can be used for chemical transport. The PtO2 diffuses at lower temperatures where it may deposit well-formed crystals of platinum metal.

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