Question

what is the oxidation number of Cr(NO3)3 ??

Answer 1

Answer:

Explanation:

Explanation: NO3- is the nitrate ion, since the overall charge of the anion is -1, you don't need to worry about the O's and the N's as they are unimportant. So since there are three nitrate anions, their total oxidation number is -1 x 3 = -3

Answer 2

Answer:

The oxidation number of chromium in is +3.

Explanation:

Oxidation number is defined as the number holded by an atom by either gain or loss of electrons when it chemically combines with another atom.

As in compound we know that the oxidation number of nitrate ion is -1. So, for three nitrate ions the charge will be -3.

Let us assume that the charge on chromium (Cr) is x. Therefore, calculate the oxidation number of chromium as follows.

                     

                      (as the compound is neutral so its total charge is equal to zero)

                         x - 3 = 0

                          x = +3

Therefore, the charge present on chromium atom is +3.

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