MEDIUMMCQ SINGLENEET ChemistryInorganic Chemistryd and f Block elementsEx :O O
Which of the following is not true about the transition elements ?
A.They show variable oxidation states
B.Their ions have a strong tendency to form complexes
C.Their compounds usually do not absorb ultraviolet
D.Their ions and complex ions usually possess✓ Correct
Explanation
They are coloured can absorb ultraviolet and visible lights. 40. Which of the following ions is colourless in solution ? (a) V3+ (b) Cr3+ (c) Co2+ (d) Sc3+ 3 0 Sc has d configuration. Colour comes from the electronic transition of the unpaired d – electrons for the transition elements. Since there are no unpaired electrons for 3 Sc , it is colourless. 3 2 V has d configuration. It has 2 unpaired electrons. 3 3 Cr has d configuration. It has 3 unpaired electrons. 2 7 Co has d configuration. It has 3 unpaired electrons. Thus, these three ions have some colour in solution. Hence, opt
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