What may be the temperature of sulphuric acid used in the STEM process

1.	What may be the temperature of sulphuric acid used in the STEM process?
A.	10 <sup>o</sup>C
B.	21 <sup>o</sup>C
C.	38 <sup>o</sup>C
D.	50 <sup>o</sup>C
Answer» D. 50 <sup>o</sup>C

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