Which pair of ions gives a blue colour in an aqueous state?
$V^{+4}, Ni^{+2}, Ti^{+3}, Co^{+2}, Fe^{+3}, Cu^{+2}$
$V^{+4}, Ni^{+2}, Ti^{+3}, Co^{+2}, Fe^{+3}, Cu^{+2}$
- A$V^{+4}, Cu^{+2}$
- B$Co^{+2}, Ni^{+2}$
- C$Fe^{+3}, Ti^{+3}$
- D$Cr^{+3}, Zn^{+2}$
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