Which of the above metal oxide has the minimum thermal decomposition temperature?

C a O

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F e O

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Z r O_{2}

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M g O

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Solution

The correct option is B $Z r O_{2}$
$Z r O_{2}$ has the minimum thermal decomposition temperature, as it crosses zero $Δ G$ line at minimum temperature as shown in the Ellingham diagram.
Option C is correct.

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