Solve the following

Question:

Let $C_{\mathrm{NaCl}}$ and $\mathrm{C}_{\mathrm{BaSO}_{4}}$ be the conductances (in S) measured for saturated aqueous solutions of $\mathrm{NaCl}$ and $\mathrm{BaSO}_{4}$, respectively, at a temperature $\mathrm{T}$. Which of the following is false?

  1. Ionic mobilities of ions from both salts increase with T

  2. $\mathrm{C}_{\mathrm{BaSO}_{4}}\left(\mathrm{~T}_{2}\right)>\mathrm{C}_{\mathrm{BaSO}_{4}}\left(\mathrm{~T}_{1}\right)$ for $\mathrm{T}_{2}>\mathrm{T}_{1}$

  3. $\mathrm{C}_{\mathrm{NaCl}}\left(\mathrm{T}_{2}\right)>\mathrm{C}_{\mathrm{NaCl}}\left(\mathrm{T}_{1}\right)$ for $\mathrm{T}_{2}>\mathrm{T}_{1}$

  4. None of the above

Correct Option: , 4

Solution:

Ionic mobility increases with increase in temperature, which increases the conductance of the solution, while conductance of $\mathrm{NaCl}$ solution is independant of temperature above $400^{\circ} \mathrm{C}$. Because the temperature is not given, so none of the option is correct.

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