Chlorine, bromine, and iodine usually have an oxidation number of –1, unless they’re in combination with oxygen or fluorine. Still have questions? Thus two sulphur atoms in Na 2 S 2 O 3 have oxidation number of – 2 and +6. total= -4. The sum of all oxidation numbers in a neutral compound must equal zero. A gas in a rigid container at 25°C has a pressure of 0.96 atm. The sum of the oxidation numbers in a monatomic ion is equal to the overall charge of that ion. As we know,molemecular formula of bleaching powder is CaOCl2.It contains two Cl atom.One atom of Cl has +1 & other has -1 oxidation number. The sum of the oxidation numbers of all of the atoms in a neutral compound is 0. Write the oxidation number above the # 1 0. 0 0. sowjanya. 10 years ago-1. The oxidation number of fluorine is always –1. They are positive and negative numbers used for balancing the redox reaction. The oxidation number of Cl is -1 in HCl, but the oxidation number of Cl is +1 in HOCl. of Cl in CaOCl2. one chlorine has +1 oxidation state and another has -1. (ii) Oxidation number of chlorine in CaOCl 2 (bleaching powder) In bleaching powder, Ca(OCl)Cl, the two Cl atoms are in different oxidation states i.e., one Cl – having oxidation number of –1 and the other as OCl – having oxidation number of +1. 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. The oxidation number of a Group 1 element in a compound is +1. 2 2. :-) In this formula it is not so strait forward what the numbers are for each element. The oxidation state of chlorine in CaCl2 is? Oxidation number of Cl in CaOCl2 (bleaching powder) is (a) zero, since it contains Cl2 asked Oct 23, 2018 in Redox reactions and electrochemistry by Sagarmatha ( 54.4k points) redox reaction Oxidation number of oxygen is -2, as here is two oxygen atoms . Oxidation number of Ca is 2 because In this compound O and Cl makes an ion (OCl)-1 and the rent chlorine in Cl also -1 So Ca + OCl + Cl = 0 X + (-1) + (-1) = 0 X - 2 = 0 X = +2 In bleaching powder, Ca(OCl)Cl, the two Cl atoms are in different oxidation states i.e., one Cl– having oxidation number of –1 and the other as OCl– having oxidation number of +1. This -4 is balanced by Cl to give resultant oxidation number -1. 5 years ago. Oxidation no. So, oxidation number of Cl in ClO2- is +3. ex. Get answers by asking now. Solution for What is the oxidation state of Cl in CaOCl2 ? 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