Chapter 1: Chemical reactions and equations

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Chemical reactions and equations


What happens when dilute hydrochloric acid is added to iron filings? Tick the correct answer

(a) Hydrogen gas and iron chloride are produced

(b) Chlorine gas and iron hydroxide are produced

(c) No reaction takes place

(d) Iron salt and water are produced


Displacement reaction is the type of reaction in which the reactive metal displaces less reactive metal in the solution.

Iron is more reactive metal than hydrogen. So, when iron fillings added to dilute hydrochloric acid, iron displaces hydrogen to form brown-coloured solid of ferrous chloride along with the evolution of hydrogen gas. The chemical equation for this reaction is as follows:

Fe (s) + HCl (aq) → FeCl2 (s) + H2 (g)

Therefore, the correct answer is (a) Hydrogen gas and iron chloride are produced.

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