Practical Chemistry Question 9
Question 9 - 2024 (31 Jan Shift 1)
Molar mass of the salt from $NaBr, NaNO _3, KI$ and $CaF _2$ which does not evolve coloured vapours on heating with concentrated $H _2 SO _4$ is ________ $gmol^{-1}$, (Molar mass in $gmol^{-1}: Na: 23, N: 14, K: 39$, $O: 16, Br: 80, I: 127, F: 19, Ca: 40$)
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Answer (78)
Solution
$CaF _2$ does not evolve any gas with concentrated $H _2 SO _4$.
$NaBr \rightarrow$ evolve $Br _2$
$NaNO _3 \rightarrow$ evolve $NO _2$
$KI \rightarrow$ evolve $I _2$
