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1. I'm not sure but Bismuth only form Bismuth SubCarbonate and not just Carbonate. So the Chemical Formula for it should be (BiO)2CO3
2. Ca(MnO4)2
3. Si(CH3COO)4 - Silicon only bond in a +4 oxidation state in when bonded to Acetate.
4. W3(BO3)4 

Note that all the numbers in this Chemical Formula are in Subscript.

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