JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
Among, \(\mathrm{Sc}, \mathrm{Mn}, \mathrm{Co}\) and Cu , identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is _____ BM (in nearest integer).
- A 4
- B 5
- C 6
- D 7
Answer & Solution
Correct Answer
(A) 4
Step-by-step Solution
Detailed explanation
Sc Mn Co Cu Enthalpy of Atomisation (kJ/mole) 326 281 425 339 \(\begin{aligned} & \mathrm{n}=3 \\ & \mu=\sqrt{15}=3.87 \end{aligned}\) Nearest integer \(=4\)
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
- Number of electrons that Vanadium \((Z=23)\) has in p-orbitals is equal to \(......\)JEE Mains 2021 Medium
- For the reaction \(H _{2} F _{2( g )} \rightarrow H _{2( g )}+ F _{2( g )}\) \(\Delta U =-59.6\,kJ\,mol ^{-1} \text { at } 27^{\circ}\,C\). The enthalpy change for the above reaction is (-) \(kJ mol ^{-1}\) [nearest integer] Given : \(R =8.314\,JK ^{-1}\,mol ^{-1}\)JEE Mains 2022 Hard
- At room temperature, a dilute solution of urea is prepared by dissolving \(0.60\, g\) of urea in \(360\, g\) of water. If the vapour pressure of pure water at this temperature is \(35\, mm\, Hg\), lowering of vapour pressure will be: .............. \(\mathrm{mm\,Hg}\) (molar mass of urea \(= 60\, g\, mol^{-1}\))JEE Mains 2019 Hard
- Sulphur \((S)\) containing amino acids from the following are: \((a)\) isoleucine \((b)\) cysteine \((c)\) lysine \((d)\) methionine \((e)\) glutamic acidJEE Mains 2023 Medium
- Given below are two statements :
Statement \((I)\) : \(p-\)nitrophenol is more acidic than \(m-\)nitrophenol and \(o-\)nitrophenol.
Statement \((II)\) : Ethanol will give immediate turbidity with Lucas reagent.
In the light of the above statements, choose the correct answer from the options given below :JEE Mains 2024 Hard - Consider the following reactions : \((i)\) Glucose \(+ ROH \quad \stackrel{\text { dry } HCl }{\longrightarrow}\) Acetal \(\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{x\,eq.of}}\) acetyl derivative \((ii)\) Glucose \(\xrightarrow{{Ni/{H_2}}}A\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{y\,\,eq.\,of}}\) acetyl derivative. \((iii)\) Glucose \(\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{z\,ed.\,of}}\) acetyl derivative. \(' x ^{\prime},{ }^{\prime} y ^{\prime}\) and \({ }^{\prime} z^{\prime}\) in these reactions are respectively.JEE Mains 2020 Hard
More PYQs from JEE Mains
- Let \(A\) and \(B\) be two sets containing four and two elements respectively. Then the number of subsets of the set \(A \times B,\) each having at least three elements is :JEE Mains 2015 Hard
- Let \(\mathrm{f}: R \rightarrow R\) be function defined as \(f ( x )=\left\{\begin{array}{cc}3\left(1-\frac{| x |}{2}\right) & \text { if }| x | \leq 2 \text { } \\ 0 & \text { if }| x |>2 \text { }\end{array}\right.\) Let \(g: R \rightarrow R\) be given by \(g(x)=f(x+2)-f(x-2)\). If \(n\) and \(m\) denote the number of points in \(R\) where \(\mathrm{g}\) is not continuous and not differentiable, respectively, then \(\mathrm{n}+\mathrm{m}\) is equal to \(....\)JEE Mains 2021 Hard
- \(\mathop \smallint \limits_0^\pi \sqrt {1 + 4{{\sin }^2}\frac{x}{2} - 4\sin \frac{x}{2}} \;dx = \)JEE Mains 2014 Hard
- The rate constant for a first order reaction is \(20\,min ^{-1}\). The time required for the initial concentration of the reactant to reduce to its \(\frac{1}{32}\) level is \(........\times 10^{-2}\,min\). (Nearest integer)(Given: \(\quad \ln 10=2.303, \log 2=0.3010)\)JEE Mains 2023 Hard
- A proton with a kinetic energy of \(2.0\,eV\) moves into a region of uniform magnetic field of magnitude \(\frac{\pi}{2} \times 10^{-3}\,T\). The angle between the direction of magnetic field and velocity of proton is \(60^{\circ}\). The pitch of the helical path taken by the proton is \(..........cm\) (Take, mass of proton \(=1.6 \times 10^{-27}\,kg\) and Charge on proton \(=1.6 \times 10^{-19}\,kg)\)JEE Mains 2023 Medium
- The radiation corresponding to \(3 \rightarrow 2\) transition ofhydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of \(3 \times 10^{-4}\) \(T\) If the radius of the largest circular path followed by these electrons is \(10.0\ mm\), the work function of the metal is close to......\( eV\)JEE Mains 2014 Hard