You assign oxidation numbers to the elements in a compound by using the Rules for Oxidation Numbers. Anonymous. This problem has been solved! Relevance. Dec 11,2020 - Find oxidation number on pt ? Anonymous. 7 years ago. The carbon in CO2 has an oxidation state of +4 and, in C2H5OH, -2. When an element is oxidized, its oxidation number increases. So I would give H in N2H4 a +1 each which makes N = -2 each. When H is with a metal, such as CaH2, I always give it an oxidation state of -1 because it's obvious this is a hydride. Zn added to HCl yields the spontaneous reaction Zn(s) + 2H+(aq) → Zn2+ (aq) + H2(g).The oxidation number of Zn has increased from 0 to 2+. The oxidation number of a Group VIIA element in a compound is -1, except when that element is combined with one having a higher electronegativity. would it be 1 or 0? Source(s): med school. D. 2+ E. 3+ MEDIUM. C) +2. Upvote(2) How satisfied are you with the answer? Pages 49. 0 0. H2 [ PtCL6]? The sum of the oxidation numbers of all of the atoms in a neutral compound is 0. Oxidation by water with H 2 liberation is highly desirable, as it can serve as an environmentally friendly way for the oxidation of organic compounds. School University of the Fraser Valley; Course Title CHEMISTRY 1000; Type. For each H atom, 1 electron is lost as the change in oxidation number is +1. the answer is E. 3 0. Answer. Relevance. 1 decade ago. Lv 6. The oxidation number of an element is an assigned number and is the charge on an element in a compound if the bonds were 100% ionic. 0 1. james. +6 +4 +7 +2 +3 +5 . In H2, the oxidation number of H is 0. , it oxidation number of S is +6, and that of F is -1 in when with. It is -1 in peroxides the O-atom therefore, the oxidation number decreases this site is pretty you! So, the oxidation number of S is +6, and that of S is +6, and of... Nah, CaH 2, and that of the Cl would be +1 and that S! 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