COMEDK · Chemistry · 23. d and f Block Elements
Arrange the following ions in the decreasing order of total covalent double bonds formed by the transition metal(s) with oxygen.
A. = chromate B. = permanganate C. = dichromate
- A \(\mathrm{B}>\mathrm{C}>\mathrm{A}\)
- B \(\mathrm{A}>\mathrm{B}>\mathrm{C}\)
- C \(\mathrm{B}>\mathrm{A}>\mathrm{C}\)
- D \(\mathrm{C}>\mathrm{B}>\mathrm{A}\)
Answer & Solution
Correct Answer
(D) \(\mathrm{C}>\mathrm{B}>\mathrm{A}\)
Step-by-step Solution
Detailed explanation
Chromate (\(CrO_4^{2-}\)): Cr is in +6 state, bonded to 4 oxygens. Structure has 2 double bonds (\(Cr=O\)) and 2 single bonds (\(Cr-O^-\)). Total \(= 2\) Permanganate (\(MnO_4^-\)): Mn is in +7 state, bonded to 4 oxygens. Structure has 3 double bonds (\(Mn=O\)) and 1 single bond…
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
- An aqueous solution of glucose boils at \(100.01^{\circ} \mathrm{C}\). The number of glucose molecules in a solution containing \(100 \mathrm{~g}\) of water is _________ [\(\mathrm{K}_{\mathrm{b}}\) for water is \(0.5 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\)]COMEDK 2024 Medium
- Identify the INCORRECT statementCOMEDK 2026 Medium
- The formula mass of Mohr's salt is \(392 \mathrm{~g}\). The iron present in it is oxidised by \(\mathrm{KMnO}_{4}\) in acid medium. The equivalent mass of Mohr's salt isCOMEDK 2018 Hard
- \(5.8 \mathrm{~g}\) of a gas maintained at \(95^{\circ} \mathrm{C}\) occupies the same volume as \(0.368 \mathrm{~g}\) of hydrogen gas maintained at a temperature of \(17^{\circ} \mathrm{C}\) and pressure being the same atmospheric pressure for both the gases. What is the molecular mass of the unknown gas?COMEDK 2023 Medium
- Identify the reagents \(\mathrm{X}, \mathrm{Y}\) and \(\mathrm{Z}\) used to bring out the following reactions.
COMEDK 2023 Medium - Identify the incorrect statement/s.
A. The maximum number of electrons that can be accommodated in an atom, in which the largest Principal quantum number value is 4 , is 54 . B. According to Rydberg, all series of lines in Hydrogen spectrum can be described by the equation:
\(\frac{1}{\lambda}=109677\left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right) \mathrm{cm}^{-1}\) where \(\left(n_1Explore more questions on appCOMEDK 2025 MediumFrom COMEDK More PYQs from COMEDK
- The parametric equation of a parabola is \(x=t^{2}+1, y=2 t+1\). The cartesian equation of its directrix isCOMEDK 2012 Easy
- The altitude of a cone is 20 cm and its semi vertical angle is \(30^\circ\). If the semi vertical angle is increasing at the rate of 2 radians per second, then the radius of the base is increasing at the rate ofCOMEDK 2023 Medium
- \(100 \mathrm{~mL}\) of \(\frac{N}{5} \mathrm{HCl}\) was added to \(1 \mathrm{~g}\) of pure \(\mathrm{CaCO}_{3}\). What would remain after the reaction?COMEDK 2012 Hard
- A transformer has 400 turns in its primary winding and 800 turns in its secondary winding. The primary voltage is \(20 \mathrm{~V}\) and the load in the secondary is 4 ohm. The current in the primary, assuming it to be an ideal transformer, isCOMEDK 2024 Medium
- Inverse of the matrix \(\left[\begin{array}{cc}\cos 2 \theta & -\sin 2 \theta \\ \sin 2 \theta & \cos 2 \theta\end{array}\right]\) isCOMEDK 2013 Easy
- The work done in taking an ideal gas through one cycle of operation as shown in the indicator diagram below
COMEDK 2012 Medium
-