Which of the following is false ?

Question:

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

  1. Ionic mobilities of ions from both salts increase with $\mathrm{T}$

  2. $\mathrm{C}_{\mathrm{NaCl}} \gg \mathrm{C}_{\mathrm{BaSO}_{4}}$ at a given $\mathrm{T}$

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

Correct Option: , 3

Solution:

Dissolution of $\mathrm{BaSO}_{4}$ is an endothermic reaction 50 on increasing temperature number of ions of $\mathrm{BaSO}_{4}$ decrease so it's conduction also decrease.

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