Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. The configuration of CoF 6 3– is. (e) Low spin complexes contain strong field ligands. BINGO! The usual Hund's rule and Aufbau Principle apply. If it takes less energy to pair the electrons, the complex is low-spin. (d) In high spin octahedral complexes, oct is less than the electron pairing energy, and is relatively very small. You should learn the spectrochemical series to know which are weak field ligands and which are strong field ligands. The unpaired electrons in the d-orbitals do not tent to pair up because F – is weak ligand. When talking about all the molecular geometries, we compare the crystal field splitting energy (Δ) and the pairing energy (P). Explanation: Co exists as Co 3+ in [CoF 6] 3–.The configuration of. 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.. 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. It has a magnetic moment of 6 B.M. WE HAVE A WINNER! The choice between high-spin and low-spin configurations for octahedral d 4, d 5, d 6, or d 7 complexes is easy. i)If ∆ o < P, the fourth electron enters one of the eg orbitals giving theconfiguration t 2g 3. Ligands for which ∆ o < P are known as weak field ligands and form high spin complexes. A complex can be classified as high spin or low spin. These are called spin states of complexes. 3) With manganese, a high spin and a low spin octahedral complex are actually different. Students can solve NCERT Class 12 Chemistry Coordination Compounds MCQs Pdf with Answers to know their preparation level. 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). In many these spin states vary between high-spin and low-spin configurations. We can determine these states using crystal field theory and ligand field theory. DING DING DING! [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. 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. (c) Low spin complexes can be paramagnetic. (Ligands which cause a … 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. 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. Spin states when describing transition metal coordination complexes refers to the potential spin configurations of the central metal's d electrons. The formation of complex depend on the crystal field splitting, ∆ o and pairing energy (P). Correct option (c) [CoF 6] 3– . Thanks for A2A!!! Weak field ligands: I- , Br- , SCN- , Cl- , F- , OH- , NO2- , H2O. Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 9 Coordination Compounds. Answer: usually produce low spin complexes and high crystal field splittings 9 (Crystal Field Theory) Which one of the following statements is FALSE? The terms high spin and low spin are related to coordination complexes. 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