Topic content:
2% of the oxygen inhaled into the human body is converted into highly oxidizing "reactive oxygen species", which can accelerate human aging and is called "life killer". Taking the compound sodium selenite (Na2SeO3) containing selenium element (Se) can eliminate the reactive oxygen species in the human body, so it can be inferred that the role of Na2SeO3 is ()
A. As reducing agent
B. As oxidant
C. As both oxidant and reductant
D. Neither as oxidant nor reductant
Best answer:
A
Answer analysis:
There is no explanation for this question
Test core:
Essence of redox reaction: electron transfer (gain or loss or deviation) Characteristics of redox reaction: valence rise and fall (valence of some elements changes before and after reaction, which is the basis for judging redox reaction)