JEE MAIN - Chemistry (2021 - 20th July Evening Shift - No. 15)
In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of :
HNO3
AgNO3
CuSO4
BaSO4
Explanation
Organic compound is heated with fuming nitric acid in the presence of silver nitrate in carius method.
Lunar caustic (AgNO3) is used as reagent hare to distinguish Cl$$-$$, Br- and I$$-$$ respectively as follows.
$$C{l^ - }(aq)\buildrel {AgN{O_3}} \over \longrightarrow AgCl{ \downarrow _{ppt}}$$ white
$$B{r^ - }(aq)\buildrel {AgN{O_3}} \over \longrightarrow AgBr{ \downarrow _{ppt}}$$ pale yellow
$${I^ - }(aq)\buildrel {AgN{O_3}} \over \longrightarrow AgI{ \downarrow _{ppt}}$$ Dark yellow
Lunar caustic (AgNO3) is used as reagent hare to distinguish Cl$$-$$, Br- and I$$-$$ respectively as follows.
$$C{l^ - }(aq)\buildrel {AgN{O_3}} \over \longrightarrow AgCl{ \downarrow _{ppt}}$$ white
$$B{r^ - }(aq)\buildrel {AgN{O_3}} \over \longrightarrow AgBr{ \downarrow _{ppt}}$$ pale yellow
$${I^ - }(aq)\buildrel {AgN{O_3}} \over \longrightarrow AgI{ \downarrow _{ppt}}$$ Dark yellow
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