Mg(s) + HCl(aq) --> This reaction forms an aqueous compound and a gas as products. What is the identity of the gas?
  1. Cl2(g)
  2. HCl(g)
  3. Mg(g)
  4. H2(g)
  5. MgCl2(g)
Explanation
Answer:H2(g)

In this reaction, the aqueous product is MgCl2(aq). The only remaining element is hydrogen, which forms H2(g).
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