2. calcium + hydrochloric acid -------->
3. iron (lll) + hydrochloric acid ------->
4. potassium + sulfuric acid ------>
5. calcium + sulfuric acid ------>
6. iron (lll) + sulfuric acid ------>
7. potassium + phosphoric acid ------>
8. calcium + phosphoric acid ------>
9. iron (lll) + phosphoric acid ------>
10. sodium + hydrochloric acid ------>
11. sodium + sulfuric acid ------>
12. sodium + phosphoric acid ------>
13. zinc + hydrochloric acid ------>
14. zinc + sulfuric acid ------->
15. zinc + phosphoric acid ------>