The equation ba(s) + hcl(aq) bacl2(aq) + h2(g) is an example of which type of reaction?
a. double-replacement
b. combustion
c. single-replacement
d. decomposition

The best answer would be option C. The reaction between barium metal and hydrochloric acid represents a single replacement type of reaction. This is because only the barium replaces or takes the place the hydronium ion from the hydrochloric acid yielding barium chloride and hydrogen gas.

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