The oxidation number of sulfur in calcium sulfate, CaSO4, is _____ asked Sep 10, 2016 in Chemistry by Gingerh. The oxidation number for the calcium in CaSO4 is 2+, the oxidation number for oxygen is 2-, and the oxidation number for sulfur is 6+. Maximum oxidation state of chlorine can be : View solution. In CaSO4, the oxidation number of Ca is , that of S is , and that of O is . 0 votes. The sulphate ion is made a sulphur atom covalently bonded with 4 oxygen atoms. A) +6 B) +4 C) +2 D) 0 E) -2. general-chemistry; 0 Answers. 1 Answer The oxidation number of a free element is always 0. In HF, the oxidation number of H is The oxidation number of O in compounds is usually -2, but it is -1 in peroxides. For example H2SO4, CaSO4 etc., in each of these compounds the sulfate anion combines with atoms with a net oxidation number of +2 and this creates an electrically neutral molecule. The oxidation number of sulfur in calcium sulfate, CaSO4 is +6, +4, -2, 0, +2? CaF2(s) + H2SO4(aq) → CaSO4(aq) + 2HF(g) In CaF2, the oxidation number of Ca is , and that of F is . Assign an oxidation number to each element in the reaction. In H2SO4, the oxidation number of H is , that of S is , and that of O is . We know that the total oxidation state of a ionic compound here K2SO4 is zero. We could start from a knowledge that the sulphate ion has a 2- charge, so the copper ion must have a 2+ charge and hence a +2 oxidation number. The SO4 ion has two extra electrons, so it electrically attracts the calcium ion, which has given up its two outer-most electrons, to form the compound CaSO4. Write the electron configuration of chlorine and explain why these are limiting oxidation numbers for chlorine. +2 The proper name for CuSO_4 is copper(II) sulphate - the Roman numerals denote the oxidation state for any atom which has variable oxidation states, such as transition metals. So, if O is -2 and there are 4 O atoms, that's -8. Question: The Oxidation Number Of Sulfur In Calcium Sulfate, CaSO4 Is +6, +4, -2, 0, +2? There is no oxidation number for compounds. The compound {eq}\rm H_2SO_4 {/eq} is a neutral compound. This problem has been solved! The highest positive oxidation number that chlorine can exhibit an any compound is +7, whereas its most negative oxidation number is -1. There are several ways to work this out. Now, there must be a +6 charge on the S to give an overall -2. The oxidation number of sodium in a salt is positive 3. The oxidation number of a monatomic ion equals the charge of the ion. In the redox reaction, the oxygen will always have +2 oxidation … The chemical symbol for calcium is Ca; it is in the second column of the periodic table. See the answer. That means the algebraic sum of all the anion or cation numbers is zero. Let the oxidation number of Calcium (Ca) be +x We know oxidation state of Sulphate ion is -2. The sum of the oxidation numbers of all the atoms in a compound is zero 2. View solution. The oxidation number of H is +1, but it is -1 in when combined with less electronegative elements. Net charge on Calcium Sulphate is zero (0) Therefore, +x + -2 = 0 x = 2 Therefore, the oxidation state of Ca in Calcium Sulphate is determined as +2. A 0 votes. Best answer. You can figure out the Al charge by knowing that the 2 SO4 groups give -4 charge in total and K has +1, so Al is +3. The oxidation number of chlorine in a compound is negative. answered Sep 10, 2016 by Roshaoar .