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On studying the reversible process during DTA which of the following is observed on both heating and cooling?

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On studying the reversible process during DTA which of the following is observed on both heating and cooling?

(a) Esterification

(b) Hysteresis

(c) Methylation

(d) Carboxylation

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I'd like to ask this question from Applications of DTA and TGA topic in chapter Thermal Analysis of Solid State Chemistry

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Correct answer is (b) Hysteresis

Best explanation: On both heating and cooling during the studies of reversible processes in DTA, differential thermal analysis, it is common to observe hysteresis, for instance, the exotherm that appears on cooling may be displaced to occur at a lower temperature than the corresponding endotherm which appears on heating.

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