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JEE · NEET Previous Year Question

$Which one of the following is correct for all elements from Sc to Cu?$

Topic: JEE PYQ

Answer: D. Full step-by-step solution below.

A $The lowest oxidation state shown by them is +2 .$
B $4 s orbital is completely filled in the ground state.$
C $3 d orbital is not completely filled in the ground state.$
D $The ions in +2 oxidation states are paramagnetic.$

Correct answer: D

Solution

(d) : The lowest oxidation state shown by Cu is +1 . Cu : [Ar] 3 d^{10} 4 s^{1}

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