. H2O2 changes Cr2O72- ion to CrO5 in an acidic medium, the oxidation state of Cr in CrO5 is(a) +6(b) +5(c) -10(d) +3Answer: (a)
Question
H2O2 changes Cr2O72- ion to CrO5 in an acidic medium, the oxidation state of Cr in CrO5 is
(a) +6
(b) +5
(c) -10
(d) +3
Answer: (a)
Solution
The oxidation state of Cr in CrO5 is +6.
Here's how you can determine this:
-
Oxygen usually has an oxidation state of -2.
-
In CrO5, there are five oxygen atoms, so the total oxidation state for all oxygen atoms is -2 * 5 = -10.
-
The sum of the oxidation states in a neutral compound is zero.
-
Therefore, the oxidation state of Cr in CrO5 is +6 because +6 + (-10) = 0.
So, the correct answer is (a) +6.
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