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Chemistry · 2026 · 4 marks
NEET 2026 · 21 June · Code 50 · Q62
For a salt X Y, which is a strong electrolyte, the plot of Λ m versus √c has a slope of -90.0 S cm^2 mol^-3 / 2 L^1 / 2 at 298 K. At 0.01 M…
For a salt $\displaystyle \mathbf{X Y}$, which is a strong electrolyte, the plot of $\displaystyle \Lambda_{\mathrm{m}}$ versus $\displaystyle \sqrt{\mathrm{c}}$ has a slope of $\displaystyle -90.0 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-3 / 2} \mathrm{~L}^{1 / 2}$ at $\displaystyle 298$ K . At $\displaystyle 0.01$ M concentration of $\displaystyle \mathbf{X Y}$, the value of $\displaystyle \Lambda_{\mathrm{m}}$ is $\displaystyle 145.0 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$. The limiting molar conductivity of $\displaystyle \mathbf{Y}^{-}$ion ( $\displaystyle \lambda_{Y^{-}}^0$, in $\displaystyle \mathrm{S} \mathrm{cm}^2 \mathrm{~mol}^{-1}$ ) at $\displaystyle 298$ K will be
(Given: $\displaystyle \lambda_{X^{+}}^0=74.0 \mathrm{~S} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$ )
Official answer
From NTA’s final answer key for this paper.
(1)
$\displaystyle 80.0$
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