# 8.1 Assign oxidation number to the underlined elements in each of the following species        solution-

O.N is the oxidation number

O.N of Oxygen( ) = -2 ( In case of peroxide and superoxide it wil be different ON)

O.N of hydrogen( )= +1 (In case of metalic hydride, -1)

O.N of sodium ( ) = +1

O.N of aluminium ( ) = +3

O.N of potassium ( )= +1

O.N of calcium ( ) = +2

In neutral compounds the sum of O.N of all the atoms is zero.

(a) Let the O.N of P be x (b) Let the O.N of S be x (c)  Let the O.N of P be x (d) Let the O.N of Mn be x (e) Let the O.N of O be x

Ca is an alkaline earth metal so its O.N. is +2 (f) Let the O.N of B be x

Note that in this H exists as hydride ion so its O.N. is -1 (g) Let the O.N of S be x (h) Let the O.N of S be x ## Related Chapters

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