Single Choice

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

A$${Co}^{3+}$$ and $${Cr}^{3+}$$
B$${Co}^{3+}$$ and $${Co}^{3+}$$
C$${Cr}^{3+}$$ and $${Cr}^{3+}$$
Correct Answer
D$${Cr}^{3+}$$ and $${Co}^{3+}$$

Solution

Ruby is $${ Al }_{ 2 }{ O }_{ 3 }$$ in which Red colour is obtained when $${ C }r^{ +3 }$$ is replacing $${ Al }^{ +3 }$$ ions in octahedral sites.

Emerald is $${ Be }_{ 3 }{ Al }_{ 2 }{ \left( Si{ O }_{ 3 } \right) }_{ 6 }$$ in which green colour is obtained when $${ Cr }^{ +3 }$$ is replacing $${ Al }^{ +3 }$$ in octahedral site.

Hence, the correct option is $$C$$.

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 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?

Contact Details