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JEE Main 20203 SeptemberMorning Shift
Exam
JEE Main
Year
2020
Date
3 September
Shift
Morning Shift
Subject
Chemistry
Chapter
Electrochemistry

JEE Main 2020 · 3 September · Morning Shift · Chemistry · Electrochemistry

Let C _ NaCl and C _ BaSO _ 4 , be the conductances (in S) measured...

Let CNaCl{C}_{NaCl} and CBaSO4{{C}_{BaSO}}_{4}, be the conductances (in S) measured for saturated aqueous solutions of NaClNaCl and BaSO4BaS{O}_{4} respectively, at a temperature T. Which of the following is false?

Options

  1. Alonic mobilities of ions from both salts increase with T.
  2. BCBaSO4(T2)>CBaSO4(T1)forT2>T1{C}_{{BaSO}_{4}}\left({T}_{2}\right) > {C}_{{BaSO}_{4}}\left({T}_{1}\right)for{T}_{2} > {T}_{1}
  3. CCNaCl(T2)>CNaCl(T1)forT2>T1{C}_{NaCl}\left({T}_{2}\right) > {C}_{NaCl}\left({T}_{1}\right)for{T}_{2} > {T}_{1}
  4. DCNaCl≫CBaSO4{C}_{NaCl} ≫ {C}_{{BaSO}_{4}} at given TT

Correct answer

A. lonic mobilities of ions from both salts increase with T.

Step-by-step solution

(i) Ionic mobilities decreases with increase in temperature due to increase in random motion and hence decrease in relaxation time so derease in drift speed.

(i) NaClNaCl is completely soluble salt while BaSO4{BaSO}_{4} is sparingly soluble salt so C1>>C2{C}_{1} > > {C}_{2}.

(ii) On increasse in temperature conductance increase.

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