Question

Which reaction does not occur?

Answer 1

Answer: $2HF(aq)+Cl_2(g)\rightarrow F_2(g)+2HCl(aq)$ will not occur.

Explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.

A general single displacement reaction can be represented as :

$X+YZ\rightarrow XZ+Y$

a) $2HF(aq)+Cl_2(g)\rightarrow F_2(g)+2HCl(aq)$

Flourine is more reactive than chlorine and hence this reaction cannot occur.

b) $2Na(s)+ZnF_2(aq)\rightarrow 2NaF(aq)+Zn(s)$

Sodium is more reactive than zinc and hence the reaction will occur.

c) $Fe(s)+CuCl_2(aq)\rightarrow FeCl_2(aq)+Cu(s)$

Iron is more reactive than copper and hence the reaction will occur.

d) $2HCl(aq)+Mg(s)\rightarrow MgCl_2(aq)+H_2(g)$

Magnesium is more reactive than hydrogen and hence the reaction will occur.