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Q. The oxidation number of As in $ {{H}_{3}}As{{O}_{4}} $

Rajasthan PMTRajasthan PMT 1997

Solution:

Oxidation number of as in $ {{H}_{3}}As{{O}_{4}} $ $ 3+x+(4\times -2)=0 $ $ 3+x-8=0 $ $ x=5 $