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

  • A
    $1, 2, 3, 4$
  • B
    $1, 3, 4$
  • C
    $2, 3$
  • D
    $1, 2$

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