Match List l with List ll. List I Coordination Complex List II Number of unpaired electrons (I) [Cr(CN)6]3- (a) 0 (II) [Fe(H2O)6]2+ (b) 3 (III) [Co(NH3)6]3+ (c) 2 (IV) [Ni(NH3)6]2+ (d) 4
Choose the correct answer from the options given below:
| List I Coordination Complex | List II Number of unpaired electrons |
|---|---|
| (I) [Cr(CN)6]3- | (a) 0 |
| (II) [Fe(H2O)6]2+ | (b) 3 |
| (III) [Co(NH3)6]3+ | (c) 2 |
| (IV) [Ni(NH3)6]2+ | (d) 4 |
Show Hint
To determine the number of unpaired electrons in coordination complexes, consider the oxidation state of the central metal atom, its electronic configuration, and whether the ligand is a strong or weak field ligand
- A-II, B-IV, C-I, D-III
- A-III, B-IV, C-I, D-II
- A-II, B-I, C-IV, D-III
- A-IV, B-III, C-II, D-I
The Correct Option is A
Solution and Explanation
Analysis of Complexes and Unpaired Electrons:
- Option (A) : The complex [Cr(CN)6]3− contains Cr3+ with an electronic configuration of 3d3. Cyanide (CN−) is a strong field ligand (SFL), which causes pairing of electrons.
Number of unpaired electrons = 3. - Option (B) : The complex [Fe(H2O)6]2+ contains Fe2+ with an electronic configuration of 3d6. Water (H2O) is a weak field ligand (WFL), which does not cause electron pairing.
Number of unpaired electrons = 4. - Option (C) : The complex [Co(NH3)6]3+ contains Co3+ with an electronic configuration of 3d6. Ammonia (NH3) is a strong field ligand (SFL), which causes pairing of electrons.
Number of unpaired electrons = 0. - Option (D) : The complex [Ni(NH3)6]2+ contains Ni2+ with an electronic configuration of 3d8. Ammonia (NH3) is a strong field ligand (SFL), which causes partial pairing of electrons.
Number of unpaired electrons = 2.
Final Matching: A-II, B-IV, C-I, D-III
The correct answer is option (1).
Top JEE Main Chemistry Questions
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)- At equilibrium the concentrations of and in a sealed vessel at . What will be for the reaction
- Find out the major products from the following reactions
Cobalt chloride when dissolved in water forms pink colored complex $X$ which has octahedral geometry. This solution on treating with cone $HCl$ forms deep blue complex, $\underline{Y}$ which has a $\underline{Z}$ geometry $X, Y$ and $Z$, respectively, are
- The correct order of atomic radii is:
Top JEE Main Classification of elements and periodicity in properties Questions
- The correct sequence of electron gain enthalpy of the elements listed below is
A. Ar
B. Br
C. F
D. S
Choose the most appropriate from the options given below: - Match List I with List II
- Consider the following elements.
Which of the following is/are true about A',B',C'andD' ? A. Order of atomic radii: \( B' < A' < D' < C' \)
B. Order of metallic character: \( B' < A' < D' < C' \)
C. Size of the element: \( D' < C' < B' < A' \)
D. Order of ionic radii: \( B^{+} < A^{+} < D^{+} < C^{+} \)
Choose the correct answer from the options given below: - The element which shows only one oxidation state other than its elemental form is :
- Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is ______.
B, C, N, S, O, F, P, Al, Si
Top JEE Main Questions
- In a hydrogen like atom, when an electron jumps from the $M$ - shell to the $L$ - shell, the wavelength of emitted radiation is $\lambda$. If an electron jumps from $N$-shell to the $L$-shell, the wavelength of emitted radiation will be :
- Two masses $m$ and $\frac{m}{2}$ are connected at the two ends of a massless rigid rod of length $l$. The rod is suspended by a thin wire of torsional constant $k$ at the centre of mass of the rod-mass system(see figure). Because of torsional constant $k$, the restoring torque is $\tau =k\theta$ for angular displacement $\theta$. If the rod is rota ted by $\theta_0$ and released, the tension in it when it passes through its mean position will be:
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)- The value of is
- The number of terms of an is even. The sum of the odd terms is and of the even terms is . The last term exceeds the first by . Then the number of terms in the series is ______.