Chemistry · 2026
JEE Main · 28 January 2026, Shift 2 · Q72
For strong electrolyte Λ_m increases slowly with dilution and can be represented by the equation Λ_m =Λ_m^°- Ac^1 / 2 Molar conductivity values of…
For strong electrolyte $\displaystyle \Lambda_{\mathrm{m}}$ increases slowly with dilution and can be represented by the equation
$$\Lambda_{\mathrm{m}}=\Lambda_{\mathrm{m}}^{\circ}-\mathrm{Ac}{ }^{1 / 2}
$$
Molar conductivity values of the solutions of strong electrolyte AB at $\displaystyle 18$°C are given below :
The value of constant A based on the above data $\displaystyle \left[\right.$ in $\displaystyle \left.\mathrm{S} \mathrm{cm}^2 \mathrm{~mol}^{-1} /(\mathrm{mol} / \mathrm{L})^{1 / 2}\right]$ unit is $\displaystyle \_\_\_\_$.
| c $\displaystyle \left[\mathrm{mol} \mathrm{L}^{-1}\right]$ | $\displaystyle 0.04$ | $\displaystyle 0.09$ | $\displaystyle 0.16$ | $\displaystyle 0.25$ |
| $\displaystyle \Lambda_{\mathrm{m}}\left[\mathrm{S} \mathrm{cm}^2 \mathrm{~mol}^{-1}\right]$ | $\displaystyle 96.1$ | $\displaystyle 95.7$ | $\displaystyle 95.3$ | $\displaystyle 94.9$ |
Official answer
From NTA’s final answer key for this paper.
4
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JEE Main 2026 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.