List -I List-II (A) Flespar (I) [Ag3SbS3] (B) Asbestos (II) Al2O3 . H2O (C) Pyrargyrite (III) MgSO4 . H2O (D) Diaspore (IV) KAlSi3O3 (V) CaMg3(SiO3)4
IV-A V-B II-C I-D
IV-A V-B I-C II-D
IV-A I-B III-C II-D
II-A V-B IV-C I-D
Which one of the following is used as an acid flux in metallurgy ?
CaO
SiO2
Na2CO3
SO2