SATHEE: The dand fblock elements

The dand fblock elements - Result Question 24

####24. The aqueous solution containing which one of the following ions will be colourless? (Atomic number: $S c = 21, F e = 26, T i = 22, M n$ $= 25$ )

[2005]

(a) $S c^{3 +}$

(b) $F e^{2 +}$

(c) $T i^{3 +}$

(d) $M n^{2 +}$

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Solution:

(a) $S c^{3 +} \to 3 d^{0} 4 s^{0}$

$F e^{2 +} \to 3 d^{6} 4 s^{0}$

4 unpaired $e^{-}$

$T i^{3 +} \to 3 d^{1} 4 s^{0}$

1 unpaired $e^{-}$

$Unknown environment 'tabular'$ $◻ 5$ unpaired $e^{-}$

In $S c^{3 +}$ there is no unpaired electron. So the aqueous solution of $S c^{3 +}$ will be colourless.

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The dand fblock elements - Result Question 24

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