Question:
Molar mass of the salt from NaBr, \(NaNO_3\), KI and \(CaF_2\) which does not evolve coloured vapours on heating with concentrated \(H_2SO_4\) is _____ g \(mol^{−1}\). (Molar mass in g mol−1: Na : 23, N : 14, K : 39, O : 16, Br : 80, I : 127, F : 19, Ca : 40)
Molar mass of the salt from NaBr, \(NaNO_3\), KI and \(CaF_2\) which does not evolve coloured vapours on heating with concentrated \(H_2SO_4\) is _____ g \(mol^{−1}\). (Molar mass in g mol−1: Na : 23, N : 14, K : 39, O : 16, Br : 80, I : 127, F : 19, Ca : 40)
Updated On: Nov 20, 2024
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Correct Answer: 78
Solution and Explanation
CaF$_2$ does not evolve any gas with concentrated H$_2$SO$_4$.
\[ \text{NaBr} \rightarrow \text{evolve Br}_2 \]
\[ \text{NaNO}_3 \rightarrow \text{evolve NO}_2 \]
\[ \text{KI} \rightarrow \text{evolve I}_2 \]
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