The statements a b c and d are false. Option B
What is a redox reaction?
The term redox reaction refers to a type of reaction in which there is a simultaneous oxidation and reduction of species in the reaction. This implies that one specie accepts electrons and one specie losses electrons. The whole process occurs simultaneously in the reaction.
If wee look at the reaction we can see that chloride ion was oxidized to chlorine gas and the chromate VI was reduced to chromate III. the oxidation number of hydrogen and oxygen remained the same on both sides hence the statements a b c and d are false. Option B
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