Final answer:
The chemical reactions that resulted in a white precipitate are Na2CrO4 + AgNO3, Al2(SO4)3 + Ba(NO3)2, and BaCl2 + AgNO3.
Step-by-step explanation:
A white precipitate is formed when a chemical reaction results in the formation of an insoluble salt. From the given options, the correct sets of chemical reactions that resulted in a white precipitate are:
- Na2CrO4 + AgNO3
- Al2(SO4)3 + Ba(NO3)2
- BaCl2 + AgNO3
In these reactions, the formation of a white precipitate indicates the presence of an insoluble compound.