JEE Advanced · 2011 · 10 Apr 2011 · Paper 1 · Redox Reactions and Electrochemistry

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AgNO_{3}

(aq.) was added to an aqueous KCl solution gradually and the conductivity of the solution was measured. The plot of conductance (

Λ

) versus the volume of

AgNO_{3}

(A)(P)
(B)(Q)
(C)(R)
(D)(S)✓ Correct

Answer: (D)

Solution

The reaction is:

AgNO_{3} + KCl (aq) \to AgCl (s) + KNO_{3} (aq)

Initially, there is aqueous KCl solution. As

AgNO_{3}

solution is added,

AgCl (s)

precipitates out. The conductivity remains almost constant (or slightly increases) because the formation of

KNO_{3}

compensates for the removal of

KCl

.

After the equivalence point, excess

AgNO_{3}

is added, causing conductivity to increase more rapidly. This corresponds to plot (S).

JEE Advanced · 2011 · 10 Apr 2011 · Paper 1 · Single correct option

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