A mixture of salt when heated with conc. H 2 S O 4 and M n O 2 , brown fumes are formed due to presence of which ion?

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Question: Answered & Verified by Expert

A mixture of salt when heated with conc.

H_{2} S O_{4}

and

M n O_{2}

, brown fumes are formed due to presence of which ion?

Chemistryp Block Elements (Group 15, 16, 17 & 18)NEET

Options:

A $B r^{-}$
B $N O_{3}^{-}$
C $C l^{-}$
D $I^{-}$

Solution:

2949 Upvotes Verified Answer

The correct answer is:

B r^{-}

It is a lab method for the preparation of

B r_{2}

e.g.

2 K B r + M n O_{2} + H_{2} S O_{4} \to

\underset{B r o w n g a s}{B r_{2}} + 2 K H S O_{4} + M n S O_{4}

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