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(C) $Cu(II)$ $(d^9)$ complexes have one unpaired electron,so they are paramagnetic. This is correct.$(B)$ $Cu(I)$ $(d^{10})$ complexes have no unpaire

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$4$

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(C) $Cu(II)$ $(d^9)$ complexes have one unpaired electron,so they are paramagnetic. This is correct.$(B)$ $Cu(I)$ $(d^{10})$ complexes have no unpaired electrons,so they are generally colourless due to the absence of $d-d$ transitions. This is correct.$(C)$ $Cu(I)$ is unstable in aqueous solution and undergoes disproportionation to $Cu(0)$ and $Cu(II)$,meaning it is easily oxidized to $Cu(II)$. This is correct.$(D)$ Fehling solution consists of two parts: Fehling $A$ ($CuSO_4$ solution) and Fehling $B$ (alkaline sodium potassium tartrate). The active species is the $Cu(II)$ tartrate complex. This is correct.Therefore,all $4$ statements are correct.

The number of statement$(s)$ correct from the following for copper (atomic number $29$) is/are $...$
$(A) \ Cu(II)$ complexes are always paramagnetic
$(B) \ Cu(I)$ complexes are generally colourless
$(C) \ Cu(I)$ is easily oxidized
$(D)$ In Fehling solution,the active reagent has $Cu(II)$

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The number of statement$(s)$ correct from the following for copper (atomic number $29$) is/are $...$$(A) \ Cu(II)$ complexes are always paramagnetic$(B) \ Cu(I)$ complexes are generally colourless$(C) \ Cu(I)$ is easily oxidized$(D)$ In Fehling solution,the active reagent has $Cu(II)$