COMEDK · Chemistry · 23. d and f Block Elements
Choose the correct ascending order of the second ionisation enthalpies of the given metals.
A. \(\mathrm{Fe}(\mathrm{Z}=26)\)
B. \(\mathrm{Mn}(Z=25)\)
C. \(V(Z=23)\)
D. \(\mathrm{Cr}(Z=24)\)
- A \(\mathrm{C} <\mathrm{B} <\mathrm{A} <\mathrm{D}\)
- B A \( <\) D \( <\) B \( <\) C
- C \(\mathrm{C} <\mathrm{A} <\mathrm{D} <\mathrm{B}\)
- D \(\mathrm{B} <\mathrm{A} <\mathrm{D} <\mathrm{C}\)
Answer & Solution
Correct Answer
(A) \(\mathrm{C} <\mathrm{B} <\mathrm{A} <\mathrm{D}\)
Step-by-step Solution
Detailed explanation
The second ionisation enthalpy involves the removal of an electron from the \(M^{+}\) ion. The electronic configurations of the \(M^{+}\) ions are as follows: V (\(Z=23\)): \([Ar] 3d^3 4s^1\). Removing one electron gives \(V^{+}\): \([Ar] 3d^3 4s^1\). The second ionisation…
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
- \(0.1 \mathrm{M}\) solution of \(\mathrm{AgNO}_3\) is taken in a Conductivity cell and a potential difference of \(40 \mathrm{~V}\) is applied across the ends of a column of this solution whose diameter is \(4.0 \mathrm{~cm}\) and length of the column is \(12 \mathrm{~cm}\). The current used is \(0.4 \mathrm{~A}\). The Molar conductivity of the solution is _________.COMEDK 2024 Medium
- Given below are 4 subatomic particles travelling with the same velocity "v". Which of them will have the shortest wavelength?
\([A]=\text { Proton }[B]=\text { Neutron. }[C]=\text { Alpha particle. }[D]=\text { Electron. }\)COMEDK 2024 Easy - The organic compound obtained during the addition of HBr to propene in the presence of peroxide catalyst isCOMEDK 2012 Easy
- For a reaction, \(A+B \longrightarrow C+D\),
If the concentration of \(A\) is doubled without altering the concentration of \(B\), the rate gets double(d)If the concentration of \(B\) is increased by nine times without altering the concentration of \(A\), the rate gets triple(d)The order of the reaction isCOMEDK 2018 Medium - What would be the EMF of the cell in which the following reaction occurs:
\(\begin{aligned}
& \mathrm{Cd}(\mathrm{S})+2 \mathrm{H}^{+} \rightarrow \mathrm{Cd}^{2+}+\mathrm{H}_{2(\mathrm{~g})} \\
& {\left[\mathrm{H}^{+}\right]=0.02 \mathrm{M} \quad \mathrm{E}^0\left(\mathrm{Cd}^{2+} / \mathrm{Cd}\right)=-0.4 \mathrm{~V},\left[\mathrm{Cd}^{2+}\right]=0.01 \mathrm{M} \text { and partial pressure of } \mathrm{H}_2 \text { gas }=0.8 \mathrm{~atm} .}
\end{aligned}\)COMEDK 2024 Medium - Which of the following alkene on reductive ozonolysis gives ketones only as the product?COMEDK 2025 Medium
More PYQs from COMEDK
- When a body is earth connected, electrons from the earth flow into the body. This means, the body isCOMEDK 2019 Easy
- A particle at rest decays in to two particles of mass \(m_1\) and \(m_2\) and move with velocities \(v_1\) and \(v_2\). The ratio of their de Broglie wave length \(\dfrac{\lambda_1}{\lambda_2}\) is:COMEDK 2023 Medium
- The complex \(\left[\mathrm{PtCl}_2(\mathrm{en})_2\right]^{2+}\) ion showsCOMEDK 2023 Medium
- 85 . The radius of an atom is \(300 \mathrm{pm}\). If it crystallises in a face-centered cubic lattice, the length of the edge of the unit cell isCOMEDK 2014 Easy
- The \(E_{M^{3+} / M^{2+}}^o\) values for \(\mathrm{Cr}, \mathrm{Mn}, \mathrm{Fe}\) and Co are \(-0.41,+1.57,+0.77\) and +1.97 V respectively. For which of these metals, the change in oxidation state from +2 to +3 is the easiest?COMEDK 2025 Easy
- Which of the following 2 compounds exhibit both Geometrical and Structural isomerism?
\(\begin{aligned}
& \mathrm{A}=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{NO}_2 \\
& \mathrm{~B}=\left[\mathrm{Co}\left(\mathrm{NH}_3\right) \mathrm{Br}\right] \mathrm{SO}_4 \\
& \mathrm{C}=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3\left(\mathrm{NO}_2\right)_3\right] \\
& \mathrm{D}=\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3
\end{aligned}\)COMEDK 2024 Medium