Chapter 8, Problem 4STP

Interpretation Introduction

Interpretation :

The spectator ions in the reaction of silver nitrate and potassium chloride must be chosen from the given list.

Concept Introduction :

Spectator ions are those which are present in both reactant and product side. In the net ionic equation these ions are cancelled.

Answer to Problem 4STP

Correct answer: Option B is correct.

Explanation of Solution

Reason for correct option:Option B is correct because in the reaction of silver nitrate and potassium chloride a precipitate of silver chloride is formed along with potassium nitrate. Thus K+ and NO₃− are present in both reactant and product side. These are spectator ions.

  ${\text{Ag}}^{\text{+}}{\text{(aq)+NO}}_{\text{3}}{}^{\text{-}}{\text{(aq)+K}}^{\text{+}}{\text{(aq)+Cl}}^{\text{-}}\text{(aq)}\to {\text{AgCl(s)+K}}^{\text{+}}{\text{(aq)+NO}}_{\text{3}}{}^{\text{-}}\text{(aq)}\text{.}$

Conclusion

Reasons for incorrect options:Option A is incorrect as chloride ion is not present in both the sides. It is precipitated with silver cation.

Option C is incorrect as silver ion and chloride ion is precipitated as silver chloride and so these are not present in both the sides of the equation.

Option D is incorrect as silver ions is precipitated with chloride ion and not present in both the sides of the equation.