The number of statement(s) correct from the following for Copper is/are
(A) $Cu\left(II\right)$ complexes are always paramagnetic
(B) $Cu\left(I\right)$ complexes are generally colourless
(C) $Cu\left(I\right)$ is easily oxidized
(D) In Fehling solution, the active reagent has $Cu\left(I\right)$

Question

The number of statement(s) correct from the following for Copper is/are

(A) $Cu\left(II\right)$ complexes are always paramagnetic

(B) $Cu\left(I\right)$ complexes are generally colourless

(C) $Cu\left(I\right)$ is easily oxidized

(D) In Fehling solution, the active reagent has $Cu\left(I\right)$

Quantrex Academy · Accepted Answer

Correct answer: 3

Cu ( I ) have fulfilled d-subshell and does not have any unpaired electrons so, its complexes will be colourless mostly. and it will be diamagnetic. But Cu ( II ) has one unpaired electron, so, it will be paramagnetic. A, B, C are correct and D is incorrect because Fehling solution has Cu(II)

The number of statement(s) correct from the following for Copper...

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