Question

if element x forms the oxides xo and x2o3 the oxidation numbers of element x are
a)+1 and +2
b)+2 and +3
c)+1 and +3
d)+2 and +4

Answer 1

Answer:

b) +2 and +3.

Explanation:

Hello,

In this case, given the molecular formulas:

$XO$

And:

$X_2O_3$

We can relate the subscripts with the oxidation states by knowing that they are crossed when the compound is formed, for that reason, we notice that oxygen oxidation state should be -2 for both cases and the oxidation state of X in the first formula must be +2 since both X and O has one as their subscript as they were simplified:

$X^{+2}O^{-2}$

Moreover, for the second case the oxidation state of X should be +3 in order to obtain 3 as the subscript of oxygen:

$X_2^{+3}O_3^{-2}$

Thus, answer is b)+2 and +3

Best regards.

Answer 2

In the case when the element x forms the oxides xo and x2o3 the oxidation numbers of element x are option b +2 and +3.

Calculation of the number of elements:

The equation should be X2O3.

Here we can link the subscripts with the oxidation states by knowing that they should not be linked at the time when the compound should be formed. So here the oxygen oxidation state should be -2 and the oxidation state of x should be +2.

Its like

X+2O-2

Here in the second case, the oxidation state of x should be +3 for obtaining 3 and treated as the subscript of oxygen.

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