Which equations represent precipitation reactions? a. na2s + febr2 → 2nabr + fes b. mgso4 + cacl2 → mgcl2 + caso4 c. lioh + nh4i → lii + nh4oh d. 2nacl + k2s → na2s + 2kcl e. agno3 + nacl → agcl + nano3 may choose more than one

In a precipitation reaction, one of the product formed is an insoluble precipitate.

The given reactions can be written with phases included as:

A. : In this reaction one of the product, FeS is insoluble. Therefore, this is a precipitation reaction.

B. : In this reaction, the product is a solid(insoluble). So, this is a precipitation reaction too.

C.: In this reaction, both the products are soluble. So this is not a precipitation reaction.

D.: In this reaction, both the products are soluble. So this is not a precipitation reaction.

E. : In this reaction, the product AgCl is a precipitate. So, it is a precipitation reaction.