Since the anion has an oerall charge of '-2 ' , then we create a sum . d. Which identifies an oxidation-reduction reaction? Relevance. However in SO3^2- (aq) the Oxidation states are: Sulfur (+4) & Oxygen (-2). Electrons are transferred. Rules for assigning oxidation numbers. To answer this question, let's first look at the atoms in the compounds for which we know the oxidation number. Answer (g) :- Fe2(SO3)3 species contain SO3(2-) ion. hydrogen. Answer: oxidation number of S in SO3-2 is +4. The oxidation number of a free element is always 0. (Recall that O has an oxidation number of -2.) The alkali metals (group I) always have an oxidation number â¦ The sum of the oxidation numbers of all of the atoms in a neutral compound is zero. 2 Answers. PLEASE HELp In the redox conversion of SO3 to SOâ, S is ? Mg + Cl2 mc005-1.jpg Mg2+ + 2Clmc005-2.jpg. The oxidation number for SULFUR is +4, and the oxidation number for oxygen is -2. ... Why? Since the zinc ion's charge is +2, so is its oxidation number (rule 2). S = 4 The oxid'n number of sulphur. Oxygen has an oxidation number of 2-. and its oxidation number goes from ? to ? The sulphite anion is SO3^2- Using '-2' for oxygen as the yardstick . What is the oxidation number for S in the compound SO3? The easiest way is to remember certain common numbers: O (in most cases): -II, H: +I For oxidation numbers we use Roman numerals! Which best identifies why the rusting of an iron nail in the presence of water and oxygen is an oxidation-reduction reaction? That would be the oxidation number. Answer Save. S + - 6 = -2 . Roger the Mole. It can be determined using the following rules: 1. Oxidation State of Sulfur + (3 Oxidation state of Oxygen) = -2 Oxidation state of sulfur + (3 (-2 view the full answer Previous question Next question What is the oxidation number for S in the compound SO3? S is reduced and its oxidation number goes from 6+ â¦ Hydrogen has an oxidation number of 1+. c. The given compound is, Let the oxidation state of S be, 'x' Hence, the oxidation state of S is, (+4) Add . Favorite Answer. Lv 7. x= +4 Then there are 3 oxygens hence 3 x -2 = -6 . so, x+3(-2)= -2. x-6=-2. The oxidation number of a Group 17 element in a binary compound is -1. c. Given the reaction below, which is the oxidized substance? The oxidation number (ON) of an element details the number of electrons lost or gained by the element in order to achieve its current state. Don't get the two confused, they may both be written with out the charge, but if SO3 is (aq) it has a charge of -2. For HSO3- it is the negative sign, indicating a -1 charge for the bisulfite ion. Sum of charges in this case, for these polyatomic ions, equals the charge on the ion. Consider the following reaction. + indicates +1 charge, sum of charges of compounds always equals zero. The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion. The oxidation number of a monatomic ion equals the charge of the ion. Explanation: let oxidation number of S be x. oxidation number of O is -2 . So, in SO3, in order to create a net neutral, or zero charge, the S must have an oxidation number 6+ to cancel out the 3*(-2)= -6 of the oxygen in the compound. The Oxidation states in in SO3(g) are: Sulfur (+6) & Oxygen (-2), b/c SO3(g) has no charge. (Recall that O has an oxidation number of -2.) 4 years ago. Fluorine in compounds is always assigned an oxidation number of -1. S = -2 + 6 . Because the sulfite ion (SO3) has a -2 charge (and you'd have to consult a list of polyatomic ions to know that) and the zinc ion MUST be +2 in order to balance that out. Commonly, sulfur (s) forms 2- oxidation state, but in bisulfite it forms 4+.