(d) displacement reaction.3. What happens when dilute hydrochloric acid is added to iron Allings? Tick thecorrect 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.4. What is a balanced chemical equation? Why should chemical equations bebalanced?5. Translate the following statements into chemical equations and then balance them.(a) Hydrogen gas combines with nitrogen to form ammonia.(b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide.(c) Barium chloride reacts with aluminium sulphate to give aluminium chlorideand a precipitate of barium sulphate.(d) Potassium metal reacts with water to give potassium hydroxide and hydrogengas.6. Balance the following chemical equations.(a) HNO, + Ca(OH), → Ca(NO3)2 +H,O(b) NaOH + H2SO4 → Na, SO4+H2O(c) NaCl + AgNO, → AgCl + NaNO,(d)BaCl, +H,SO4 → BaSO, + HCIllowing reactions.​