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The oxidation number for carbon in H2CO3 is +4, is so option d.
It is the electrical charge of an atom when it is part of a compound. This charge depends on the number of electrons gained, lost or shared by an atom.
H C O
Oxidation number: +1 +4 -2
Carbon (Z=6) can have oxidation numbers ranging from -4 to +4.
C can present different oxidation states within the same compound that contains more than one atom of it.
Learn more about the state or oxidation number at https://brainly.com/question/29100691
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