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The correct answer is oxidation
What is classified as oxidation-reduction?
A reduced half and an oxidised half, which always occur together, make up redox processes. While the oxidised half experiences electron loss and an increase in oxidation number, the reduced half obtains electrons and the oxidation number declines. The mnemonic devices OIL RIG, which stand for "oxidation is loss" and "reduction is gain," are simple ways to memorise this. The total number of electrons in a redox reaction remains unchanged. In the reduction half reaction, another species absorbs those that were released in the oxidation half reaction.
In a redox reaction, two species exchange electrons, and they are given unique names:
The oxidising agent is an ion or molecule that takes electrons; by doing so, it oxidises other species.
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