The reactions of ion exchange include the reaction between: a) sodium and chlorine;

The reactions of ion exchange include the reaction between: a) sodium and chlorine; b) zinc and sulfur; c) iron and hydrochloric acid; d) barium chloride solution and silver nitrate solution.

To answer this question, we write down the equations of chemical reactions:

a) 2Na + Cl2 = 2NaCl – as you can see, this is a compound reaction,

b) Zn + S (t) = ZnS – this is also a compound reaction,

c) Fe + 2HCl = FeCl2 + H2 ↑ is a substitution reaction,

d) BaCl2 + 2AgNO3 = Ba (NO3) 2 + 2AgCl ↓ – and this is an ion exchange reaction (correct answer).