Which of the following sets of ions contains | vedclass

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(B) Ions are colored if they have unpaired electrons in their $d$-orbitals,allowing for $d-d$ transitions.$(1) \ Cu^{2+} \ ([Ar] 3d^9)$: Has $1$ unpai

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$1, 3, 4$

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(B) Ions are colored if they have unpaired electrons in their $d$-orbitals,allowing for $d-d$ transitions.$(1) \ Cu^{2+} \ ([Ar] 3d^9)$: Has $1$ unpaired electron. It is colored.$(2) \ Ti^{4+} \ ([Ar] 3d^0)$: Has $0$ unpaired electrons. It is colorless.$(3) \ Co^{2+} \ ([Ar] 3d^7)$: Has $3$ unpaired electrons. It is colored.$(4) \ Fe^{3+} \ ([Ar] 3d^5)$: Has $5$ unpaired electrons. It is colored.Therefore,the set of colored ions is $(1, 3, 4)$.

Which of the following sets of ions contains colored ions?
$(1) \ Cu^{2+}$ $(2) \ Ti^{4+}$ $(3) \ Co^{2+}$ $(4) \ Fe^{3+}$

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Which of the following sets of ions contains colored ions?$(1) \ Cu^{2+}$ $(2) \ Ti^{4+}$ $(3) \ Co^{2+}$ $(4) \ Fe^{3+}$