Single Choice

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

AI and II
Correct Answer
BII and III
CI and III
DI, II and III

Solution

I. $$Fe^{2+}\ : \ [Ar] 3d^6$$, i.e., 4 unpaired electrons
$$\therefore$$ Coloured ion, [ref. image I]

II. $$Ni^{2+} \ : \ [Ar]3d^8$$, i.e., 2 unpaired electrons
$$\therefore$$ Coloured ion, [ref. image II]

III. $$Al^{3+}=[Ne]$$, i.e., no unpaired electron in 3d, colourless ion.

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

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)

d - block and f - block Elements

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

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