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$AgN{O_3}\,\left( {aq} \right)$ was added to an aqueous $KCl$ solution gradually and the conductivity of the solution was measured. The plot of conductance ($\Lambda $) versus the volume of $AgN{O_3}$ is
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A) P
B) Q
C) R
D) S


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Last updated date: 13th Jun 2024
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Answer
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Hint: The conductivity of a solution depends upon the quantity of ions at the same time on the mobility of ions present in the solution
Usually $C{l^ - }$ and $N{O_3}^ - $ have the same mobility hence both will have the similar effect on the value of conductance

Complete step by step solution:
The reaction for this question will be
$AgN{O_3} + KCl \to KN{O_3} + AgCl \downarrow $

Initially the solution consist only of two type of ions from $KCl$ that are ${K^ + }$ and $C{l^ - }$
Now when $AgN{O_3}$ is added to this solution there will be four types of ions in the solution as follow
${K^ + },C{l^ - },A{g^ + }and\,N{O_3}^ - $
As we know that $A{g^ + }$ will react with $C{l^ - }$ to form a white precipitate of $AgCl$
Now this will reduce the amount of $C{l^ - }$ but this decrease ions will be compensated by the $N{O_3}^ - $ ions which have the same mobility as $C{l^ - }$
Now whatever the change happened in conductance value due to elimination of $C{l^ - }$ ions was compensated by $N{O_3}^ - $ ions hence the value of conductance remains constant for some time as respect to volume of $AgN{O_3}$
After some time all the $C{l^ - }$ ions will be consumed by $A{g^ + }$ for forming white precipitate of $AgCl$
And further addition of $AgN{O_3}$will increase amount of $A{g^ + }$ causing a rapid increase in the conductance value of solution
The reaction for this question will be
$AgN{O_3} + KCl \to KN{O_3} + AgCl \downarrow $
Hence, we find out that the conductivity of the solution initially remain constant but after excess addition of $AgN{O_3}$it increased rapidly
Thus, the option is “D” the correct solution for the given question.

Note:
Further the conductivity of a solution also depends upon the size of the ion, on the dielectric constant and viscosity of solvent and the temperature of the solution
The $S.I$ unit for measurement of conductance is Siemens $\left( S \right)$