What type of reaction does the following equation represent? FeS+2HCl→FeCl2+H2S
A. synthesis reaction
B. double-displacement reaction
C. single-displacement reaction
D. decomposition reaction

B. double-replacement RXN

Explanation:

more specifically, this is a precipitation rxn.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

1.solid

2.carbon dioxide

3.helium