Which pair of ions gives a blue colour in an | vedclass

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(A) Most compounds of transition metals are coloured due to $d-d$ transitions.The aqueous colours of the given ions are:$Ni^{+2} = 	ext{Green}$$V^{+4

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$V^{+4}, Cu^{+2}$

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(A) Most compounds of transition metals are coloured due to $d-d$ transitions.The aqueous colours of the given ions are:$Ni^{+2} = 	ext{Green}$$V^{+4} = 	ext{Blue}$$Ti^{+3} = 	ext{Purple}$$Co^{+2} = 	ext{Pink}$$Fe^{+3} = 	ext{Yellow}$$Cu^{+2} = 	ext{Blue}$Therefore,the pair of ions that exhibit a blue colour in an aqueous state is $V^{+4}$ and $Cu^{+2}$.

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

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