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Number of ions which given blue colour i...

Number of ions which given blue colour in aqueous state:
`V^(+4),Ni^(+2),Ti^(+3),Co^(+2),Fe^(+3),Cu^(+2)`

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The correct Answer is:
2
`V^(+4),Cu^(+2)`
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GRB PUBLICATION-D-BLOCK ELEMENTS-Subjective Type
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