Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which transitional metal ions are colourless? (1) \[T{{i}^{4+}}\] (2) \[C{{u}^{+}}\] (3) \[Z{{n}^{2+}}\] (4) \[C{{u}^{3+}}\]A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: A
Solution :
Transitional metal ions having \[(n-1){{d}^{1-9}}\]electronic configuration are coloured while those have\[(n-1)d{}^\circ \]or\[(n-1){{d}^{10}}\]configuration are colourless: \[T{{i}^{4+}}\] (Z = 22) \[3{{d}^{0}}\text{ }4{{s}^{0}}\]colourless \[C{{u}^{+}}\](Z = 29)\[3{{d}^{10}}\text{ }4{{s}^{0}}\] colourless \[Z{{n}^{2+}}\](Z = 30)\[3{{d}^{10}}\text{ }4{{s}^{0}}\]colourless \[C{{r}^{3+}}\](Z = 24)\[3{{d}^{3}}\text{ }4{{s}^{0}}\]coloured
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