Chapter U4.73, Problem 2E

Interpretation Introduction

Interpretation:

Difference between single exchange reaction and double exchange reaction must be explained.

Concept introduction:

A single exchange reaction is that in which one element is replaced for another in a compound.

A double exchange reaction is that in which two cations or two anions are exchanged.

Answer to Problem 2E

In a single exchange or single displacement reaction, only one cation or anion is exchanged with other in a compound, whereas in a double exchange or double displacement reaction two cations or two anions are exchanged.

Explanation of Solution

A single exchange reaction is given below.

  $Zn+H_{2}S{O}_4\to ZnS{O}_4+H_2$

In this reaction H of H₂SO₄ is exchanged with Zn.

A double exchange reaction is given below.

  $NaCl+AgN{O}_3\to AgCl+NaN{O}_3$

In this case, Ag is exchanged with Na so AgCl and $NaN{O}_3$ is formed.