For which one of the following acids is chlorine in the +5 oxidation state? HCl

Question

For which one of the following acids is chlorine in the +5 oxidation state? HCl HClO HClO_2 HClO_3 HClO_4 Using the redox reaction below determine which element is oxidized and which is reduced. 4NH_3(aq) + 3Ca(ClO)_2(aq) rightarrow 2N_2(g) + 6H_2O_(1) + 3CaCl_2(aq) H is oxidized and N is reduced N is oxidized and Cl is reduced N is oxidized and O is reduced Cl is oxidized and O is reduced Cl is oxidized and N is reduced In the following chemical reaction the oxidizing agent is 5H_2O_2 + 2MnO^-_4 + 6H^+ rightarrow 2Mn^2+ + 8H_2O + 5O_2 H_2O_2 MnO^-_4 H^+ Mn2^+ O_2 What is the total number of moles (n) of electrons exchanged between the oxidizing agent and the reducing agent in the overall redox equation: 5 Ag^+ (aq) + Mn2^+ (aq) + 4H_2O_(l) rightarrow 5Ag(s) + MnO^-_4 (aq) + 8H^+(aq) 1 2 3 5 7 Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25 degree C.

Explanation / Answer

Ans 1. D HClO3

The oxidation number of hydrogen is +1 in the compound and that of oxygen is -2.

As the compound is altogether neutral so the oxidation states should add up to zero.

Lets assume oxidation state of chlorine as x

+1 + x + ( 3 * -2) = 0

x = +5

so the oxidation state of chlorine is +5 in HClO3

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