Single Choice

For $$Zn^{2+}$$, $$Ni^{2+}$$, $$Cu$$, and $$Cr^{2+}$$ which of the following statements is correct?

AOnly $$Zn^{2+}$$ is colourless and $$Ni^{2+}$$, $$Cu^{2+}$$ and $$Cr$$ are coloured
Correct Answer
BAll the ions are coloured
CAll the ions are colourless
D$$Zn^{2+}$$and $$Cu^{2+}$$ are colourless while $$Ni^{2+}$$ and $$Cr^{2+}$$ are coloured

Solution

Since $$Zn^{+2}$$ have fully filled $$d$$ orbital having no unpaired electrons,it does not undergo electronic transitions,hence colourless.However,rest of the elements given as $$Ni^{+2}$$ , $$Cu^{+2}$$ and $$Cr^{+2}$$ has unpaired electrons which can undergo electronic transitions and hence show colours.

SIMILAR QUESTIONS

d - block and f - block Elements

Which of the following ions will exhibit colour in aqueous solutions?

d - block and f - block Elements

Which one of the following ions will be colourless in an aqueous solution?

d - block and f - block Elements

In which of the following pairs are both the ions coloured in aqueous solution? [At. No. : $$Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27$$]

d - block and f - block Elements

The transition metal ions responsible for color in Ruby and Emerald are, respectively :

d - block and f - block Elements

The color of $$Co{ Cl }_{ 3 }.5{ NH }_{ 3 }.{ H }_{ 2 }O$$ is:

d - block and f - block Elements

Which of the following compound is expected to be coloured?

d - block and f - block Elements

Which of these ions is expected to be coloured in aqueous solution? I. $${Fe}^{3+}$$ II. $${Ni}^{2+}$$ III. $${Al}^{3+}$$

d - block and f - block Elements

Identify the oxidation states of titanium $$(Z=22)$$ and copper $$(Z=29)$$ in their colourless compounds:

d - block and f - block Elements

Predict which of the following will be coloured in aqueous solution? $$Ti^{3+}, V^{3+}, Cu^{+}, Sc^{3+}, Mn^{2+}, Fe^{3+}$$ and $$Co^{2+}$$. Give reasons for each

d - block and f - block Elements

Choose the correct answer from the alternative given. Amongst $$TiF_6^{2-}$$, $$CoF$$, $$Cu_2$$ $$Cl_2$$ and $$NiCl$$, which are the colourless species? (atomic number of Ti = 22, Co = 27, Cu = 29, Ni = 28)

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