Question

Calculate the oxidation number of underlined elements in the following species:

CO2 , Cr2O7 2-, Pb3O4 , CHCl2, PO4 3- , S2O3 2-, HNO3, K2MnO4, NH4+

Answer 1

Answer:

the oxidation number of carbon in carbon dioxide (CO2) is +4.

The oxidation number of chromium in the dichromate ion is +6.

The oxidation number of oxygen is -2 of pb304

CH2Cl2, the oxidation state of C is 0, hydrogen is 1+ and Chlorine (Cl) is 1-.

the oxidation number of phosphorous is+5.

oxidation number of S in S2O2−3 should be +2.

the oxidation number of the nitrogen atom in HNO3 is +5.

the oxidation number of Mn is +6 in K2MnO4.

NH4+ has 1+