Question

In DTA, the ___________________ of sample and reference should be______________ until any thermal event take place. Fill up the appropriate options for the two blanks given from the choices given below.

(a) Concentration, different

(b) Concentration, same

(c) Temperature, different

(d) Temperature, same

This question was addressed to me in final exam.

I'm obligated to ask this question of Differential Thermal Analysis and Differential Scanning Calorimetry topic in division Thermal Analysis of Solid State Chemistry

Answer 1

Correct choice is (d) Temperature, same

For explanation: In the differential thermal analysis, DTA method, the temperature of the sample and reference material should always be same until any thermal event takes place such as melting, decomposition or cage in crystal structure, occurs in the sample, in which case the temperature either lags behind (if endothermic) or leads (if exothermic) the reference temperature.