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Question

Which of the following changes requires a reducing agent?

A
CrO24Cr2O27
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B
BrO3BrO
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C
H3AsO3HAsO24
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D
Al(OH)3Al(OH)4
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Solution

The correct option is D BrO3BrO
BrO3BrO
+5 +1 reduction is taking place.
CrO24Cr2O27
+6 +6
H3AsO3HAsO24
+3 +5 oxidation is taking place.
Al(OH)3Al(OH)4
+3 +3
Hence, a reducing agent is required for the second reaction.

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