
Oxidation state of in is:
Answer
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Hint:Oxidation number is the charge acquired by the species may be positive, negative or zero by gain or loss of electrons. To solve this we must know the oxidation number of oxygen.
Complete answer
We are given a polyatomic anion . In the given polyatomic anion, we have to find the oxidation number of manganese.
We know that the charge on an oxygen atom is .
Sum of all the oxidation numbers in a polyatomic ion is equal to the charge on the ion. Thus, the total charge on the polyatomic anion is .
Thus,
Charge on
Substitute for the charge on , x for the oxidation number of and for the charge on . Thus,
Thus, the oxidation number of in is .
Note: Rules for assigning the oxidation number to elements are as follows:
i) The oxidation number of an element in its free or uncombined state is always zero.
ii) The oxidation number of monatomic ions is the same as that of the positive or negative charge on the ion.
iii) The sum of all the oxidation numbers in a neutral compound is zero.
iv) The sum of oxidation numbers in a polyatomic ion is equal to the total charge on the polyatomic ion.
v) The oxidation number of alkali metals is always .
vi) The oxidation number of alkaline earth metals is always .
vii) The oxidation number of hydrogen is always .
viii) The oxidation number of oxygen is always .
Complete answer
We are given a polyatomic anion
We know that the charge on an oxygen atom is
Sum of all the oxidation numbers in a polyatomic ion is equal to the charge on the ion. Thus, the total charge on the polyatomic anion is
Thus,
Charge on
Substitute
Thus, the oxidation number of
Note: Rules for assigning the oxidation number to elements are as follows:
i) The oxidation number of an element in its free or uncombined state is always zero.
ii) The oxidation number of monatomic ions is the same as that of the positive or negative charge on the ion.
iii) The sum of all the oxidation numbers in a neutral compound is zero.
iv) The sum of oxidation numbers in a polyatomic ion is equal to the total charge on the polyatomic ion.
v) The oxidation number of alkali metals is always
vi) The oxidation number of alkaline earth metals is always
vii) The oxidation number of hydrogen is always
viii) The oxidation number of oxygen is always
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