Molar mass of the salt from $\mathrm{NaBr}, \mathrm{NaNO}_3, \mathrm{KI}$ and $\mathrm{CaF}_2$ which does not evolve coloured vapours on heating with concentrated $\mathrm{H}_2 \mathrm{SO}_4$ is $\_\_\_\_$ gmol ${ }^{-1}$, (Molar mass in $\mathrm{gmol}^{-1}: \mathrm{Na}: 23, \mathrm{~N}: 14, \mathrm{~K}: 39$, $0: 16, \mathrm{Br}: 80, \mathrm{I}: 127, \mathrm{~F}: 19, \mathrm{Ca}: 40$
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Solution
$\mathbf{C a F}_2$ does not evolve any gas with concentrated $\mathrm{H}_2 \mathrm{SO}_4$.
$\mathrm{NaBr} \rightarrow$ evolve $\mathrm{Br}_2$
$\mathrm{NaNO}_3 \rightarrow$ evolve $\mathrm{NO}_2$
$\mathrm{KI} \rightarrow$ evolve $\mathrm{I}_2$
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