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At a certain temperature, the value of the slope of the plot of osmotic pressure $(\pi)$ against concentration $\left(C\right.$ in $\mathrm{mol} \mathrm{L}^{-1}$ ) of a certain polymer solution is $291 \mathrm{R.}$ The temperature at which osmotic pressure is measured, is $(R$ is gas constant)
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The correct answer is:
$18 ^\circ \mathrm{C}$
$$
\begin{array}{l}
\text { Slope. } R T=291 R \text { or } T=291 \mathrm{K} \\
\therefore \text { Temperature }=291-273=18^{\circ} \mathrm{C}
\end{array}
$$
\begin{array}{l}
\text { Slope. } R T=291 R \text { or } T=291 \mathrm{K} \\
\therefore \text { Temperature }=291-273=18^{\circ} \mathrm{C}
\end{array}
$$
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