Which of the following gives the layer test?

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(D) The layer test is used to identify halide ions like $I^{-}$ and $Br^{-}$.When an aqueous solution containing $I^{-}$ or $Br^{-}$ is treated with c

Vedclass · Accepted Answer

Both $(A)$ and $(B)$

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(D) The layer test is used to identify halide ions like $I^{-}$ and $Br^{-}$.When an aqueous solution containing $I^{-}$ or $Br^{-}$ is treated with chlorine water in the presence of an organic solvent like $CHCl_3$ or $CCl_4$,the halogen is liberated.$2I^{-} + Cl_2 \rightarrow I_2 + 2Cl^{-}$$2Br^{-} + Cl_2 \rightarrow Br_2 + 2Cl^{-}$The liberated $I_2$ imparts a violet color to the organic layer,while $Br_2$ imparts an orange-red color.Therefore,both $I^{-}$ and $Br^{-}$ give the layer test.

Column-$I$	Column-$II$
$P$. $NaBr + \text{Conc. } H_2SO_4 \rightarrow$	$A$. Colourless gas
$Q$. $Na_2S + \text{dil. } HCl \rightarrow$	$B$. Brown colour
$R$. $NaNO_2 + \text{dil. } HCl \rightarrow$	$C$. Rotten egg smell
$S$. $NaNO_3 + \text{Conc. } H_2SO_4 \rightarrow$	$D$. Paramagnetic

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