Analytical Chemistry Question 18
A mixture when heated with conc. $ H_2SO_4 $ and $ MnO_2 $ brown fumes are formed due to
Options:
A) $ B{r^{-}} $
B) $ NO_3^{-} $
C) $ C{l^{-}} $
D) $ {I^{-}} $
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Answer:
Correct Answer: A
Solution:
It is a lab method for the preparation of $ Br_2 $ e.g. $ 2\ KBr\ +\ MnO_2\ +\ H_2SO_4\ \to\ 2\ KHSO_4\ +\ Br_2 $
$ \underset{Brown\ gas}{\mathop{Br_2}}\ +\ 2\ KHSO_4\ +\ MnO_4^{-}\ +\ 4H^+\rightarrow 2\ K^+\ +\ 2\ SO_4^{2-}\ +\ Br_2\ +\ Mn^{2+}\ +\ 2H_2O$
BETA
