JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
The difference in the number of unpaired electrons of a metal ion in its high-spin and low-spin octahedral complexes is two. The metal ion is
- A \(Ni^{2+}\)
- B \(Fe^{2+}\)
- C \(Co^{2+}\)
- D \(Mn^{2+}\)
Answer & Solution
Correct Answer
(C) \(Co^{2+}\)
Step-by-step Solution
Detailed explanation
\(Co^{2+}\) high spin \(t_{2g}^5\, e_g^2\, ‘3’\) unpaired electrons \(Co^{2+}\) low spin \(t_{2g}^6\, e_g^1\, ‘1’\) unpaired electron Difference is \(3 -1 = 2\)
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
- The reaction of \([Image]\) with bromine and \(KOH\) gives \(RNH _{2}\) as the end product. Which one of the following is the intermediate product formed in this reaction?
JEE Mains 2022 Medium - The \(pH\) of ammonium phosphate solution, if \(pK _{ a }\) of phosphoric acid and \(pk _{ b }\) of ammonium hydroxide are \(5.23\) and \(4.75\) respectively, is ..... .JEE Mains 2021 Medium
- Consider all the structural isomers with molecular formula \(C _5 H _{11} Br\) are separately treated with KOH (aq) to give respective substitution products, without any rearrangement. The number of products which can exhibit optical isomerism from these is_________ .JEE Mains 2026 Hard
- The correct order of increasing intermolecular hydrogen bond strength is .... .JEE Mains 2022 Easy
- Given below are two statements :
Statement I : Nitrogen forms oxides with +1 to +5 oxidation states due to the formation of \(\mathrm{p} \pi-\mathrm{p} \pi\) bond with oxygen.
Statement II : Nitrogen does not form halides with +5 oxidation state due to the absence of d-orbital in it.
In the light of given statements, choose the correct answer from the options given below.JEE Mains 2025 Medium - Match List \(I\) with List \(II\):
List \(I\) (Complexes) List \(II\) (Hybridisation) \(A\) \(\left[ Ni ( CO )_4\right]\) \(I\) \(sp ^3\) \(B\) \(\left[ Cu \left( NH _3\right)_4\right]^{2+}\) \(II\) \(dsp^2\) \(C\) \(\left[ Fe \left( NH _3\right)_6\right]^{2+}\) \(III\) \(sp^3d^2\) \(D\) \(\left[ Fe \left( H _2 O \right)_6\right]^{2+}\) \(IV\) \(d^2sp^3\) JEE Mains 2023 Medium
More PYQs from JEE Mains
- During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in \(NH _4 OH\) solution when sodium carbonate extract was first acidified with dil. \(HNO _3\) and then \(AgNO _3\) solution was added. This indicates presence of _______.JEE Mains 2024 Medium
- Which one of the following compounds does not exhibit resonance ?JEE Mains 2021 Hard
- The correct match between items of List \(-I\) and List \(-II\) is
List \(-I\) List \(-II\) \((A)\) Phenelzine \((p)\) Pyrimidine \((B)\) Chloroxylenol \((q)\) Furan \((C)\) Uracil \((r)\) Hydrazine \((D)\) Ranitidine \((s)\) Phenol JEE Mains 2018 Hard - Find the correct statements related to group 15 hydrides.
A. Reducing nature increases from NH\(_3\) to BiH\(_3\)
B. Tendency to donate lone pair of electrons decreases from NH\(_3\) to BiH\(_3\)
C. The stability of hydrides decreases from NH\(_3\) to BiH\(_3\)
D. HEH bond angle decreases from NH\(_3\) to SbH\(_3\) (E = Elements of group 15)
Choose the correct answer from the options given below:JEE Mains 2026 Medium - A body of mass \(M\) and charge \(q\) is connected to a spring of spring constant \(k\). It is oscillating along \(x-\) direction about its equilibrium position, taken to be at \(x = 0\), with an amplitude \(A\). An electric field \(E\) is applied along the \(x-\) direction. Which of the following statements is correct?JEE Mains 2018 Hard
- For a train engine moving with speed of \(20 \;ms ^{-1}\). the driver must apply brakes at a distance of \(500 \;m\) before the station for the train to come to rest at the station. If the brakes were applied at half of this distance, the train engine would cross the station with speed \(\sqrt{ x }\; ms ^{-1}\). The value of \(x\) is \(..............\) (Assuming same retardation is produced by brakes)JEE Mains 2023 Medium