Summary
The prelims comprise:
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A. mercury (II) chloride monothiourea1,4 [Hg(SCN2H4)Cl]Cl
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B. mercury(II) chloride dithiourea1,2,3 [Hg(SCN2H4)2] Cl2
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C. mercury(II) CHLORIDE TRITHIOUREA5 [Hg(SCN2H4)3]Cl2
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D. mercury(II) chloride tetrathiourea1,3 [Hg(SCN2H4)4]Cl2