Single Choice

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

A$$Fe^{2+}$$
B$$Mn^{2+}$$
C$$Ti^{3+}$$
D$$Sc^{3+}$$
Correct Answer

Solution

$$(A)$$ $$Fe\quad [Ar]3d^64s^2$$
$$Fe^{+2}\quad [Ar]3d^6$$
$$4$$ unpaired $$e^-s\longrightarrow$$ paramagnetic.
$$(B)$$ $$Mn\quad [Ar]3d^54s^2$$
$$Mn^{+2}\quad [Ar]3d^5$$
$$5$$ unpaired $$e^-s\longrightarrow$$ paramagnetic.
$$(C)$$ $$Ti\quad [Ar]3d^24s^2$$
$$Ti^{+3}\quad [Ar]3d^1$$
$$1$$ unpaired $$e^-s\longrightarrow$$ paramagnetic.
$$(D)$$ $$Sc\quad [Ar]3d^14s^2$$
$$Sc^{+3}\quad [Ar]$$
$$0$$ unpaired $$e^-s\longrightarrow$$ dimagnetic.
Ions which are paramagnetic show colour in aqueous solution.

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

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)

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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