An aqueous solution of X is added slowly to an aqueous solution of Y as shown in List I. The variation in conductivity of these reactions is given in List II. Match List I with List II and select the correct using the code given below the lists:List IList II (P) (1) Conductivity decreases and then increases(Q) (2) Conductivity decreases and then does not change much(R) (3) Conductivity increases and then does not change much(S) (4) Conductivity does not change much and then increase

Engineering

Chemistry

Conductometric Titration

Question

An aqueous solution of X is added slowly to an aqueous solution of Y as shown in List I. The variation in conductivity of these reactions is given in List II. Match List I with List II and select the correct using the code given below the lists:

List I	List II
(P) $\underset{X}{{(C_{2} H_{5})}_{3} N} + \underset{Y}{{CH}_{3} COOH}$	(1) Conductivity decreases and then increases
(Q) $\underset{X}{KI (0.1 M)} + \underset{Y}{{AgNO}_{3} (0.01 M)}$	(2) Conductivity decreases and then does not change much
(R) $\underset{X}{{CH}_{3} COOH} + \underset{Y}{KOH}$	(3) Conductivity increases and then does not change much
(S) $\underset{X}{NaOH} + \underset{Y}{HI}$	(4) Conductivity does not change much and then increase

P → 4, Q → 3, R → 2, S → 1

P → 2, Q → 3, R → 4, S → 1

P → 1, Q → 4, R → 3, S → 2

P → 3, Q → 4, R → 2, S → 1

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Checking easiest options Q and R

(Q) KI + AgNO₃ → AgI (s) + KNO₃

X Y

On adding KI to AgNO₃ solution, Ag⁺ is replaced by K⁺ as Ag⁺ and K⁺ have approximately same conductivity so conductivity does not change much upto equivalence point after which on adding KI conductivity increases.

(R) CH₃COOH + KOH → CH₃COOK + H₂O

X Y

On adding CH₃COOH to KOH solution OH¯ is replaced by CH₃COO¯ so conductivity decreases upto equivalence point after which on adding CH₃COOH further conductivity does not change much as CH₃COOH is a weak acid (also in the presence of common ion dissociation of CH₃COOH will be quite lesser)