Q.

The highest possible oxidation numbers of uranium and plutonium, respectively are x and y. The sum of these numbers is ___.

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answer is 13.

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Detailed Solution

The oxidation states of plutonium include +2, +3, +4, +5, +6 and +7. Therefore, Plutonium can only reach an oxidation state of +7. 
Uranium show + 6 oxidation.
So, the sum of these oxidation state = 7+6 = 13
Hence, the correct answer is 13.

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