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In the schematic DTA sequence having reversible and irreversible changes, starting with the hydrated material, which of the following steps occurs first on heating?

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In the schematic DTA sequence having reversible and irreversible changes, starting with the hydrated material, which of the following steps occurs first on heating?

(a) Esterification

(b) Methylation

(c) Rehydration

(d) Dehydration

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My question is based upon Applications of DTA and TGA topic in portion Thermal Analysis of Solid State Chemistry

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The correct choice is (d) Dehydration

Best explanation: During the DTA, differential thermal analysis sequence having reversible and irreversible changes when started with hydrated material,  dehydration is the first step that occurs on heating and appears as an endotherm On cooling, the melt crystallizes and the polymeric change also occur, exothermically on cooling but rehydration does not occur.

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