Let CNaCl and CBaSO4 be the conductance (in S) measured for saturated aqueous solutions of NaCl and BaSO4 , respectively, at a temperature T. Which of the following is false ?
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a
CBaSO4 T2>CBaSO4 T1 for T2>T1
b
CNaClT2>CNaClT1 for T2>T1
c
CNaCl>>CBaSO4 at a given T
d
Ionic mobilities of ions from both salts increase with T.
answer is B.
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Detailed Solution
Here, NaCl is strong electrolyte so it ions completely at room temperature. So its ionisation no changes (V-U less extent charge) with increase of temperature. But BaSO4 is weak electrolyte and hence its conductance increases with temperature.