Question

Write reactions for a metal undergoing:
(i) Reaction with Oxygen
(ii) Reaction with Water
(iii) Reaction with Acids
(iv) Displacement Reactions
Explain the concept behind the displacement reactions.​ [5 MARKS]

Answer 1

Reactions : 1 Mark each
Concept : 1 Mark

(i) $2Mg+O_2\to 2MgO$
(ii) $Mg+2H_{2}O\to Mg(OH{)}_2+H_2$
(iii) $Mg+2HCl\to MgC{l}_2+H_2$
(iv) $Mg+ZnC{l}_2\to MgC{l}_2+Zn$

Whether a reaction will lead to displacement of the metal depends on the relative position of the two metals in the metal reactivity series. A metal (say M) can displace any metal which lies below it in the reactivity series.