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Q.

Reddish brown gas is obtained when the following are treated with conc. H₂SO₄.

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a

${Br}^{⊖}$

b

${NO}_{2}^{⊖}$

c

${NO}_{3}^{⊖}$

d

${SO}_{3}^{2 -}$

answer is A, B, C.

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Detailed Solution

${Br}^{Θ} ions give {Br}_{2}, {NO}_{2}^{Θ} and {NO}_{3}^{Θ} give {NO}_{2} gas which are brown in colour.$

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Reddish brown gas is obtained when the following are treated with conc. H2SO4.