[Given atomic number of Cu = 29, Ni = 28,Mn = 25, Fe = 26]
[Given atomic number of Cu = 29, Ni = 28,Mn = 25, Fe = 26]
Correct Answer: 6
Solution and Explanation
The green bead indicates the presence of Fe3+. The number of unpaired electrons in Fe3+ is 5. The spin-only magnetic moment is given by:
\( \mu = \sqrt{n(n + 2)} \, \text{BM} \)
Substituting \( n = 5 \):
\( \mu = \sqrt{5(5 + 2)} = \sqrt{35} \approx 5.92 \, \text{BM} \)
Nearest integer = 6.
Learn with videos:
Top Questions on Qualitative Analysis
In the group analysis of cations, Ba$^{2+}$ & Ca$^{2+}$ are precipitated respectively as
- JEE Main - 2026
- Chemistry
- Qualitative Analysis
- A first row transition metal (M) does not liberate \( \mathrm{H_2} \) gas from dilute HCl.
1 mol of aqueous solution of \( \mathrm{MSO_4} \) is treated with excess aqueous KCN and then \( \mathrm{H_2S(g)} \) is passed through the solution.
The amount of \( \mathrm{MS} \) (metal sulphide) formed from the above reaction is ________ mol.
- JEE Main - 2026
- Chemistry
- Qualitative Analysis
- Statement-I : Test for nitrite; sulphanilic acid and 1-napthylamine are used.
Statement-II : Acidified nitrite is di-azotized with sulphanilic acid and coupled with 1-napthylamine.
Select the correct statement.- JEE Main - 2026
- Chemistry
- Qualitative Analysis
- In general tests of Ba$^{2+}$ and Ca$^{2+}$ give the respective tests as:
- JEE Main - 2026
- Chemistry
- Qualitative Analysis
- When sodium fusion extract of an organic compound was treated with CHCl$_3$, then violet colour of halogen appears. If 0.15 gm of the organic compound gives 0.12 gm of the silver halide, then find the percentage of halide in the organic compound.
- JEE Main - 2026
- Chemistry
- Qualitative Analysis
Questions Asked in JEE Main exam
Which one of the following graphs accurately represents the plot of partial pressure of CS₂ vs its mole fraction in a mixture of acetone and CS₂ at constant temperature?
- JEE Main - 2026
- Organic Chemistry
- For two identical cells each having emf \(E\) and internal resistance \(r\), the current through an external resistor of \(6\,\Omega\) is the same when the cells are connected in series as well as in parallel. The value of the internal resistance \(r\) is ________ \(\Omega\).
- JEE Main - 2026
- Current electricity
- For three unit vectors \( \vec a, \vec b, \vec c \) satisfying \[ |\vec a-\vec b|^2 + |\vec b-\vec c|^2 + |\vec c-\vec a|^2 = 9 \] and \[ |2\vec a + k\vec b + k\vec c| = 3, \] the positive value of \( k \) is:
- JEE Main - 2026
- Vector Algebra
In the given figure, the blocks $A$, $B$ and $C$ weigh $4\,\text{kg}$, $6\,\text{kg}$ and $8\,\text{kg}$ respectively. The coefficient of sliding friction between any two surfaces is $0.5$. The force $\vec{F}$ required to slide the block $C$ with constant speed is ___ N.
(Given: $g = 10\,\text{m s}^{-2}$)
- JEE Main - 2026
- Rotational Mechanics
- The system of linear equations
$x + y + z = 6$
$2x + 5y + az = 36$
$x + 2y + 3z = b$
has- JEE Main - 2026
- Matrices and Determinants