Chemistry · 2016
Purification and Characterisation of Organic CompoundsLassaigne's Test and Detection of Other Elements
JEE Main · 10 April 2016, Shift 1 · Q51
Sodium extract is heated with concentrated HNO_3 before testing for halogens because:
Sodium extract is heated with concentrated $\displaystyle \mathrm{HNO}_3$ before testing for halogens because :
Official answer
(3)
$\displaystyle \mathrm{S}^{2-}$ and $\displaystyle \mathrm{CN}^{-}$, if present, are decomposed by conc. $\displaystyle \mathrm{HNO}_3$ and hence do not interfere in the test.
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