Consider the following table$-$
Column-$I$ Column-$II$
$A$. Best and latest technique for isolation,purification and separation of organic compounds $i$. Chromatography
$B$. In Lassaigne's test for $N$ $ii$. Vacuum distillation
$C$. In Lassaigne's test for $S$ $iii$. Violet coloured complex is formed
$D$. Aniline is separated from water by $iv$. Prussian blue coloured complex is formed
$E$. Glycerol is purified from spent lye $v$. Steam distillation

The correct match is$-$

  • A
    $A-i, B-iv, C-iii, D-v, E-ii$
  • B
    $A-iv, B-v, C-iii, D-ii, E-i$
  • C
    $A-i, B-iv, C-iii, D-v, E-ii$
  • D
    $A-v, B-iii, C-iv, D-ii, E-i$

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$(i)$ If nitrogen and sulphur are both present,what observation is observed?
$(ii)$ If bromine is present,what is the observation?
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$(iv)$ What is the reason for adding $FeSO_4$ to the Lassaigne extract?
$(v)$ Why is the Prussian blue colour observed?
$(vi)$ What does the violet colour with sodium nitroprusside in the Lassaigne extract indicate?

Why is nitric acid $(HNO_3)$ added to sodium extract before adding silver nitrate $(AgNO_3)$ for testing halogens?

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