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.

Question

Prashant Kotian · Accepted Answer

Correct answer: A-R; B-S; C-Q; D-P. (A) A weak base added to a weak acid forms a salt (strong electrolyte), so conductivity increases. After equivalence, adding more weak base doesn't increase ions significantly, so it stabilizes. (B) Adding KI to AgNO3 substitutes Ag+ with K+ (similar mobility), so conductivity stays practically constant. After all Ag+ is precipitated, excess KI adds K+ and I- ions, increasing conductivity. (C) Adding weak acid to a strong base replaces highly mobile OH- with slower CH3COO-, decreasing conductivity. After equivalence, adding weak acid adds few ions, so it stabilizes. (D) Adding strong base to strong acid replaces highly mobile H+ with slower Na+, decreasing conductivity. After equivalence, excess strong base adds mobile OH-, increasing conductivity. Therefore, correct answer is A-R; B-S; C-Q; D-P.

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