(e) Low spin complexes contain strong field ligands. [F (H[Fe(H O) ]3+ ihihi ith 5 i d l t It h ti t f 2 6 3+ ions are high-spin with 5 unpaired electrons. The configuration of CoF 6 3– is. The formation of complex depend on the crystal field splitting, ∆ o and pairing energy (P). Thanks for A2A!!! The unpaired electrons in the d-orbitals do not tent to pair up because F – is weak ligand. If it takes less energy to pair the electrons, the complex is low-spin. Magnetic Properties of Coordination Complexes K 3 [Fe(CN) 6] has a magnetic moment of 2.3 B.M., which is a d5 low-spin complex with one unpaired electron. When talking about all the molecular geometries, we compare the crystal field splitting energy (Δ) and the pairing energy (P). It has a magnetic moment of 6 B.M. Students can solve NCERT Class 12 Chemistry Coordination Compounds MCQs Pdf with Answers to know their preparation level. All we have to do is compare the energy it takes to pair electrons with the energy it takes to excite an electron to the higher energy (e g) orbitals. You should learn the spectrochemical series to know which are weak field ligands and which are strong field ligands. Weak field ligands: I- , Br- , SCN- , Cl- , F- , OH- , NO2- , H2O. The key difference between high spin and low spin complexes is that high spin complexes contain unpaired electrons, whereas low spin complexes tend to contain paired electrons.. The usual Hund's rule and Aufbau Principle apply. (Ligands which cause a … Ligands for which ∆ o < P are known as weak field ligands and form high spin complexes. DING DING DING! BINGO! Explanation: Co exists as Co 3+ in [CoF 6] 3–.The configuration of. A In an octahedral crystal field, the d electrons on a metal ion occupy the eg set of orbitals before they occupy the t2g set of orbitals Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 9 Coordination Compounds. The terms high spin and low spin are related to coordination complexes. Examples of low-spin d^6 complexes are ["Cr"("CN")_6]^(3-) and "Cr"("CO")_6, and examples of high-spin d^6 complexes are ["CrCl"_6]^(3-) and "Cr"("H"_2"O")_6. It just categorizes, qualitatively, how the metal d orbitals are filled in crystal field theory after they are split by what the theory proposes are the ligand-induced electron repulsions. 16. In many these spin states vary between high-spin and low-spin configurations. A complex can be classified as high spin or low spin. i)If ∆ o < P, the fourth electron enters one of the eg orbitals giving theconfiguration t 2g 3. Correct option (c) [CoF 6] 3– . (c) Low spin complexes can be paramagnetic. We can determine these states using crystal field theory and ligand field theory. Answer: usually produce low spin complexes and high crystal field splittings 9 (Crystal Field Theory) Which one of the following statements is FALSE? Spin states when describing transition metal coordination complexes refers to the potential spin configurations of the central metal's d electrons. WE HAVE A WINNER! 3) With manganese, a high spin and a low spin octahedral complex are actually different. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. The high-spin octahedral complex has a total spin state of +2 (all unpaired d electrons), while a low spin octahedral complex has a total spin state of +1 (one set of paired d electrons, two unpaired). The choice between high-spin and low-spin configurations for octahedral d 4, d 5, d 6, or d 7 complexes is easy. These are called spin states of complexes. 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