JEE Main201910 Apr 2019Evening ShiftChemistryd and f Block ElementsActual

The highest possible oxidation states of uranium and plutonium, respectively, are

Options

A4 and 6
B7 and 6
C6 and 4
D6 and 7

Correct answer

D. 6 and 7

Step-by-step solution

The electronic configuration of Uranium is, R n   5 f 3   6 d 1 7 s 2 Hence, the maximum electrons it can lose is 3 + 1 + 2 = 6 (Inner electrons do not come out due to stability) The electronic configuration of plutonium is, R n   5 f 6   7 s 2 It exhibits a maximum oxidation state of + 7 .

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