# 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

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