Question

The Transition metal ions responsible for colour in Ruby and Emerald are, respectively:
A.\[{\text{C}}{{\text{o}}^{3 + }}{\text{ and C}}{{\text{r}}^{3 + }}\]
B.\[{\text{C}}{{\text{o}}^{3 + }}{\text{ and C}}{{\text{o}}^{3 + }}\]
C.\[{\text{C}}{{\text{r}}^{3 + }}{\text{ and C}}{{\text{r}}^{3 + }}\]
D.\[{\text{C}}{{\text{r}}^{3 + }}{\text{ and C}}{{\text{o}}^{3 + }}\]

Answer 1

Hint: They both are the gemstones. They both gave their respective colour due to the one transition element ion that belongs to group 6 of d block.

Complete step by step answer:
Both ruby and emerald gave colour due to the chromium ions. Chromium ion replaces the aluminium sited in the respective lattice. Due to the property of transition metal to exhibit colour they both show colours.

Hence option C is correct.

Additional information:
A ruby is a pink to blood-red coloured gem. It is a variety of the mineral corundum. The mineral corundum is aluminium oxide. The word ruby comes from rubber. It is a Latin that means red. Since Ruby is a gem so its quality is determined by its color, cut, and clarity. The carat weight is also considered along with other qualities. Just like diamond, the shape or cutting of ruby is examined. The more finisher it is, the premium it would be. The color of ruby is also a deciding factor for its price. It is a traditional gemstone for the July month.
Emerald is a gemstone and a variety of the mineral beryl. The factors that determine the value of an emerald are the same as that of ruby. They were mined in Egypt back in the time. Emerald is the traditional gemstone for the May month.

Note:
Chromium is a d block element. The atomic number of chromium is 24 and it belongs to the 3d series of the modern periodic table.