Assertion -Bromide ion acts as a reducing agent in the recation- 2MnO-4-Br-H2O- 2MnO2-BrO-3-2OH- Reason- Oxidation number of bromine increases from -1-

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Standard XII

Chemistry

Reaction with Metals

Assertion :Br...

Question

Assertion :Bromide ion acts as a reducing agent in the recation, $2 M n O_{4}^{-} + B r^{-} + H_{2} O \to 2 M n O_{2} + B r O_{3}^{-} + 2 O H^{-}$ . Reason: Oxidation number of bromine increases from $- 1$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Assertion is correct because bromine changes oxidation number from -1 (in ${B r}^{-}$ )to +5 (in $B r O_{3}^{-}$ ). An increase in oxidation number during a reaction leads to oxidation of that species. A specie which undergoes oxidation is good reducing agent. Hence, bromide ion is acting as a reducing agent in this equation.

Reason is correct and is the correct explanation for the given assertion.A good reducing agent undergoes an increase in the oxidation number in the reaction.

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Assertion :Bromide ion acts as a reducing agent in the recation, 2MnO−4+Br−+H2O→2MnO2+BrO−3+2OH−. Reason: Oxidation number of bromine increases from −1.

Assertion :Bromide ion acts as a reducing agent in the recation, $2 M n O_{4}^{-} + B r^{-} + H_{2} O \to 2 M n O_{2} + B r O_{3}^{-} + 2 O H^{-}$ . Reason: Oxidation number of bromine increases from $- 1$ .