JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
Among \(Fe^{2+}, Fe^{3+}, Cr^{2+}\) and \(Zn^{2+}\), the ion that shows positive borax bead test and with highest ionisation enthalpy is:
- A \(Fe^{2+}\)
- B \(Zn^{2+}\)
- C \(Cr^{2+}\)
- D \(Fe^{3+}\)
Answer & Solution
Correct Answer
(D) \(Fe^{3+}\)
Step-by-step Solution
Detailed explanation
The borax bead test is given by transition metal ions that have unpaired electrons and form coloured compounds. \(Zn^{2+}\) has a completely filled \(3d^{10}\) configuration, making it colourless, so it does not give a positive borax bead test. The remaining ions and their…
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
-
In the given TLC, the distance of spot A & B are \(5 cm \& 7 cm\), from the bottom of TLC plate, respectively.
\(R _{ f }\) value of B is \(x \times 10^{-1}\) times more than A . The value of \(x\) is _______.JEE Mains 2024 Medium - Given below are two statements: Statement \(I:\) According to Bohr's model of hydrogen atom, the angular momentum of an electron in a given stationary state is quantised. Statement \(II:\) The concept of electron in Bohr's orbit, violates the Heisenberg uncertainty principle. In the light of the above statements, choose the most appropriate answer from the options given below:JEE Mains 2023 Medium
- Indicate the complex/complex ion which did not show any geometrical isomerism :JEE Mains 2021 Easy
- Arrange the following conformational isomers of \(n-\)butane in order of their increasing potential energy :
JEE Mains 2021 Easy - Given below are two statements Statement \(I\): Aqueous solution of \(K _2 Cr _2 O\), is preferred as a primary standard in volumetric analysis over \(Na _2 Cr _2 O\), aqueous solution Statement \(II:\) \(K _2 Cr _2 O\), has a higher solubility in water than \(Na _2 Cr _2 O _7\) In the light of the above statements, choose the correct answer from the options given below:JEE Mains 2023 Medium
- The values of the crystal field stabilization energies for a high spin \(d ^{6}\) metal ion in octahedral and tetrahedral fields, respectively, are :JEE Mains 2020 Medium
More PYQs from JEE Mains
- The transition element that has lowest enthalpy of atomisation isJEE Mains 2019 Easy
- Let \(a , b\) and \(c\) be the length of sides of a triangle \(ABC\) such that \(\frac{ a + b }{7}=\frac{ b + c }{8}=\frac{ c + a }{9}\). If \(r\) and \(R\) are the radius of incircle and radius of circumcircle of the triangle \(ABC\), respectively, then the value of \(\frac{R}{r}\) is equal toJEE Mains 2022 Hard
- \(I=\int \limits_{\pi / 4}^{\pi / 3}\left(\frac{8 \sin x-\sin 2 x}{x}\right) d x\). ThenJEE Mains 2022 Medium
- An electron moving with speed \(v\) and a photon moving with speed \(c,\) have same D-Broglie wavelength. The ratio of kinetic energy of electron to that of photon is -JEE Mains 2021 Medium
- Match List \(-I\) with List \(-II\).
List \(-I\) List \(-II\) \(A\). Coefficient of Viscosity \(I\). \([M L^2T^{–2}]\) \(B\). Surface Tension \(II\). \([M L^2T^{–1}]\) \(C\). Angular momentum \(III\). \([M L^{-1}T^{–1}]\) \(D\). Rotational Kimeatic energy \(IV\). \([M L^0T^{–2}]\) JEE Mains 2024 Hard - The increasing order of \(pK_b\) for the following compounds will be
JEE Mains 2020 Hard