Question:
The calculated spin only magnetic moment of $Cr^{2+}$ ion is :
The calculated spin only magnetic moment of $Cr^{2+}$ ion is :
Updated On: May 7, 2026
- 3.87 BM
- 4.90 BM
- 5.92 BM
- 2.84 BM
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Electronic configuration of $Cr=[Ar]3d^{5}\,4s^{1}$
Electronic configuration of $Cr^{+2}=[Ar]3d^{4}$
Number of unpaired electrons $= 4$
Spin only magnetic moment $=\sqrt{n\left(n+2\right)}BM $ as $n=4$
$\therefore\mu=\sqrt{4\left(4+2\right)}$
$=\sqrt{24}$
$=4.90\,BM$
Electronic configuration of $Cr^{+2}=[Ar]3d^{4}$
Number of unpaired electrons $= 4$
Spin only magnetic moment $=\sqrt{n\left(n+2\right)}BM $ as $n=4$
$\therefore\mu=\sqrt{4\left(4+2\right)}$
$=\sqrt{24}$
$=4.90\,BM$
Was this answer helpful?
0
0
Top NEET Chemistry Questions
- A $100.0\, mL$ dilute solution of $Ag ^{+}$is electrolysed for $15.0$ minutes with a current of $1.25 \,mA$ and the silver is removed completely. What was the initial $\left[ Ag ^{+}\right]$?
- Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant externalpressureof2bar Theworkdonebythe gas i s : [Given that 1Lbar= 100J)
- Unit of entropy is : -
- For a reaction, activation energy E$_a$=0 and the rate constant at 200K is 1.6×10$^6$s$^{-1}$. The rate constant at 400K will be- [Given that gas constant] R= 8.314 J K$^{-1}$ mol$^{-1}$
- Half-life period of a first order reaction is $1386\, s.$ The specific rate constant of the reaction is
View More Questions
Top NEET Questions
- A $100.0\, mL$ dilute solution of $Ag ^{+}$is electrolysed for $15.0$ minutes with a current of $1.25 \,mA$ and the silver is removed completely. What was the initial $\left[ Ag ^{+}\right]$?
- The time constant of C-R circuit is
- The chronological order of human evolution from early to the recent is
- The correct Boolean operation represented by the circuit diagram drawn is :
- The driver of a car travelling with speed $30\, m/sec$ towards a hill sounds a horn of frequency $600\, Hz.$ If the velocity of sound in air is $330\, m/s,$ the frequency of reflected sound as heard by driver is
View More Questions
Concepts Used:
Properties of D Block Elements
- Multiple oxidation states- The oxidation states of d block elements show very few energy gaps; therefore, they exhibit many oxidation states. Also, the energy difference between s and d orbital is very less. Therefore both the electrons are involved in ionic and covalent bond formation, which ultimately leads to multiple oxidation states.
- Formation of complex compounds- Ligands show a binding behavior and can form so many stable complexes with the help of transition metals. This property is mainly due to:
- Availability of vacant d orbitals.
- Comparatively small sizes of metals.
- Hardness- Transition elements are tough and have high densities because of the presence of unpaired electrons.
- Melting and boiling points- Melting and boiling points of transition are very high because of the presence of unpaired electrons and partially filled d orbitals. They form strong bonds and have high melting and boiling points.
- Atomic radii- The atomic and ionic radius of the transition elements decreases as we move from Group 3 to group 6. However, it remains the same between group 7 and group 10, and from group 11 to group 12 increases.
- Ionization enthalpy- The ionization enthalpies of the transition elements are generally on the greater side as compared to the S block elements