1.

The aqueous solution containing which one of the following ions will be colourless (Atomic number Sc=21, Fe=26, Ti=22, Mn=25)

Answer»

`Sc^(3+)`
`FE^(2+)`
`Ti^(3+)`
`Mn^(2+)`

SOLUTION :`._(21)Scrarr1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(1).`
`Sc^(+3)rarr1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)`
Due to absence of ELECTRON it will be colourless.


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