SATHEE: The dand fblock elements - Result Question 31

The dand fblock elements - Result Question 31

####31. Which of the following forms colourless compound?

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

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

(b) $V^{3 +}$

(d) $C r^{3 +}$

[2000]

Show Answer

Solution:

(a) $S c^{+ 3} \to [A r]^{18} 3 d^{0}; V^{+ 3} \to [A r]^{18} 3 d^{2}$

$T i^{+ 3} \to [A r]^{18} 3 d^{1}; C r^{+ 3} \to [A r]^{18} 3 d^{3}$

Scandium ion doesn’t contain any unpaired electron in d orbitals hence it forms colourless compound.

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