1.

Which ion will give colour in the aqueous solution ?A. `Zn^(+2)`B. `Cu^(+1)`C. `Ti^(+4)`D. `Cu^(2+)`

Answer» Correct Answer - D
`Cu^(2+)` , since all ions contain paired electrons .
`Zn^(+2) 3d^10 4s^0`
`Cu^(+1) 3d^10 3s^0 `
`Ti^(+4 ) 3d^0 4s^0`


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