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17/09/2020 8:00 pm
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Let CNaCl and CBaSO4 be the conductances (in S) measured for saturated aqueous solutions of NaCl and BaSO4 respectively, at a temperature T. Which of the following is false?
(1) Ionic mobilities of ions from both salts increase with T.
(2) CNaCl >> CBaSO4 at a given T
(3) CBaSO4(T2) > CBaSO4 (T1) for T2 > T1
(4) CNaCl(T2) > CNaCl(T1) for T2 > T1
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17/09/2020 8:04 pm
Correct answer: (1) Ionic mobilities of ions from both salts increase with T.
Explanation:
(i) Ionic mobilities decrease with increase in temperature due to increase in random motion and hence decrease in relaxation time so decrease in drift speed.
(ii) NaCl is completely soluble salt while BaSO4 is sparingly soluble salt so C1 >> C2.
(iii) On increase in temperature conductance increase.