JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
The transition metal ions responsible for colour in ruby and emerald are, respectively
- A \(Co^{3+}\) and \(Cr^{3+}\)
- B \(Co^{3+}\) and \(Co^{3+}\)
- C \(Cr^{3+}\) and \(Cr^{3+}\)
- D \(Cr^{3+}\) and \(Co^{3+}\)
Answer & Solution
Correct Answer
(C) \(Cr^{3+}\) and \(Cr^{3+}\)
Step-by-step Solution
Detailed explanation
A ruby is a crystal of alumina, aluminum oxide \((Al_2O_3)\) containing a trace of chromium \((III)\) ions replacing some of the aluminum ions. In ruby, each \(Al^{3+}\) ion and \(Cr^{3+}\) ion is surrounded by six oxide ions in an octahedral arrangement. The origin of the color…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- What is the energy (in J atom\(^{-1}\)) required for the following process?
\(Li^{2+}(g) \rightarrow Li^{3+}(g) + e^-\)
(Take the ionization energy for the H atom in the ground state as \(2.18 \times 10^{-18}\) J atom\(^{-1}\))JEE Mains 2026 Medium - The first and second ionization constants of \(H_{2}X\) are \(2.5 \times 10^{-8}\) and \(1.0 \times 10^{-13}\) respectively. The concentration of \(X^{2-}\) in 0.1 M \(H_{2}X\) solution is ______\( \times 10^{-15} M\). The value of Y is:JEE Mains 2026 Medium
- The solution from the following with highest depression in freezing point/lowest freezing point is _______.JEE Mains 2024 Hard
- An aqueous solution of a salt \(MX_2\) at certain temperature has a van't Hoff factor of \(2\). The degree of dissociation for this solution of the salt isJEE Mains 2016 Medium
- Spin only magnetic moment of \(\left[ MnBr _{6}\right]^{4-}\) is \(.....\,B.M.\) (round off to the closest integer)JEE Mains 2022 Medium
- The compound that inhibits the growth of tumors isJEE Mains 2019 Hard
More PYQs from JEE Mains
- Let \(f, g: N \rightarrow N\) such that \(f(n+1)=f(n)+f(1)\) \(\forall \, n \in N\) and \(g\) be any arbitrary function. Which of the following statements is \(NOT\) true ?JEE Mains 2021 Medium
- Let \(f, g: R \rightarrow R\) be two real valued functions defined as \(f(x)=\left\{\begin{array}{cl}-|x+3| & , \quad x<0 \\ e^{x} & , \quad x \geq 0\end{array}\right.\) and \(g(x)=\left\{\begin{array}{ll}x^{2}+k_{1} x & , \quad x<0 \\ 4 x+k_{2} & , \quad x \geq 0\end{array}\right.\), where \(k_{1}\) and \(k_{2}\) are real constants. If \((gof)\) is differentiable at \(x=0\), then \((gof) (-4)+(gof)\, (4)\) is equal toJEE Mains 2022 Hard
- For particle \(P\) revolving round the centre \(O\) with radius of circular path \(r\) and angular velocity \(\omega\), as shown in below figure, the projection of \(OP\) on the \(x\)-axis at time \(t\) is \(.................\).
JEE Mains 2023 Easy - If the normal at an end of a latus rectum of an ellipse passes through an extremity of the minor axis, then the eccentricity \(e\) of the ellipse satisfiesJEE Mains 2020 Hard
- A fair die is tossed repeatedly until a six is obtained. Let \(\mathrm{X}\) denote the number of tosses required and let \(\mathrm{a}=\mathrm{P}(\mathrm{X}=3), \mathrm{b}=\mathrm{P}(\mathrm{X} \geq 3)\) and \(\mathrm{c}=\) \(\mathrm{P}(\mathrm{X} \geq 6 \mid \mathrm{X}>3)\). Then \(\frac{\mathrm{b}+\mathrm{c}}{\mathrm{a}}\) is equal toJEE Mains 2024 Hard
- A force is represented by \(\mathrm{F}=a \mathrm{x}^2+\mathrm{bt}^{1 / 2}\). Where \(\mathrm{x}=\) distance and \(\mathrm{t}=\) time. The dimensions of \(\mathrm{b}^2 / \mathrm{a}\) are _______.JEE Mains 2024 Hard