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Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of _____________________?

Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of _____________________?

A. MgO & Na2CO3
B. MgSO4 & BaCl2
C. BaSO4 & NaCl
D. MgCO3 & NaCl