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Chemistry

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How can I tell if the following equations produce precipitates or not?

1. HgCl2 (aq) + K2CrO4 (aq) ==>
2. Ba(OH)2 (aq) + NaClO3 (aq) ==>
3. ZnI2 (aq) + CaSO4 (aq) ==>
4. SnCl2 (aq) + MgBr2 (aq) ==>

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