List-I(variation of molar conductance)		List-II(substances)
P)	Conductivity does not change much then increases	1)	$N{H}_3$is added in $C_6{H}_{5}COOH$
Q)	Conductivity increases then does not change much	2)	$C{H}_{3}COOH$ is added in $NaOH$
R)	Conductivity decreases then does not change much	3)	$KOH$ is added in $HCl$
S)	Conductivity decreases then increases	4)	Conc.$KCl$is added in dil $AgN{O}_3$
T)	Conductivity tends to zero at the end point	5)	$MgS{O}_4$is added in $Ba{\left(OH\right)}_2$

The correct answer is:

P) precipitation of AgCl takes place and  ${\text{Ag}}^{\text{+}}$ is replaced by  ${\text{K}}^{\text{+}}$ so conductivity remains almost constant
Q) Initially the conductance is low due to the feeble ionization weak acid. On the addition of weal base conductance decreases due to replacement of fast moving ${\text{H}}^{\text{+}}$ ions (Grotthus mechanism) but soon it increases due to the formation of a salt (a strong electrolyte). This continues till the equivalence point. After equivalence point conductivity virtually remains same due to feeble ionization of weak base.
R) Initially conductance is so high due to complete dissociation of NaOH but on addition of weak acid Undissociated water is formed which decreases the conductance. After equivalence point conductivity virtually remains same due to feeble ionization of weak acid.
S) Conductivity decreases due to formation of undissociated water up to equivalence point.