Question

1. when iron (fe) reacts with hydrochloric acid (hcl), hydrogen gas (h₂) and iron(ii) chloride (fecl₂) are produced. this reaction demonstrates that:

hydrochloric acid is a flammable substance.
iron(ii) chloride has the same properties as iron.
the chemical properties of iron allow it to displace hydrogen from the acid.
iron is non - reactive with acids.

Explanation:

The reaction of iron with hydrochloric acid is a single - displacement reaction. Iron, being more reactive than hydrogen in the activity series, can displace hydrogen from hydrochloric acid to form hydrogen gas and iron(II) chloride. Hydrochloric acid is not flammable under normal conditions. Iron(II) chloride has different properties from iron. And iron is reactive with acids as shown by this reaction.

Answer:

The chemical properties of iron allow it to displace hydrogen from the acid.