`AgNO_(3)(aq)` was added to an aqueous KCl soltuion gradually and conductivity of the solution was measured. The plot of conductance (A) versus the value of `AgN O_(3)` is

Options

A. P
B. Q
C. R
D. S

Answer

D

Explanation

`[K^(+)(aq)+Cl^(-)(aq)]+Ag^(+)(aq)+NO_(3)(aq)rarrk^(+)(aq)+NO_(3)^(-)(aq)+AgCl(g)`
Initially the conductance is due to `K^(+)` and `Cl^(-)` ions
On adding `AgNO_(3)`. Precipitate of `AgCl` is formed. Thus some `Cl^(-)` ions are replaced of `NO_(3)` ions. As both have nearly the same conductance, the conduc tance remains constant. After the end point, addition of `AgNO_(3)` will igve `Ag^(+)` and `NO_(3)^(-)` ions in the solution. hence conductance will increase rapidly.