Q1. What is the hybridization of the central atom in [Ni(CO)4]? (2022)
Solution:
In [Ni(CO)4], the nickel atom undergoes sp3 hybridization to accommodate four CO ligands.
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Q2. What is the oxidation state of chromium in K2Cr2O7? (2021) 2021
Solution:
In K2Cr2O7, the total charge from potassium (K) is +2, and oxygen (O) contributes -14. Let the oxidation state of Cr be x. The equation is 2x - 14 + 2 = 0, solving gives x = +6.
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Q3. What is the coordination number of the central metal ion in the complex ion [Co(NH3)6]Cl3? (2021)
Solution:
In the complex ion [Co(NH3)6]Cl3, the central metal ion Co is surrounded by 6 ammonia (NH3) ligands, which gives it a coordination number of 6.
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Q4. What is the geometry of the complex ion [Ag(NH3)2]+? (2019) 2019
Solution:
The complex [Ag(NH3)2]+ has a linear geometry due to the presence of two ligands around the silver ion.
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Q5. Which of the following statements is true for the complex [Fe(CN)6]3-? (2023)
Solution:
The complex [Fe(CN)6]3- is a low-spin complex due to the strong field nature of CN- ligands, resulting in paired electrons.
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Q6. Which of the following statements about coordination compounds is incorrect? (2023)
Solution:
Not all coordination compounds are colored; the color depends on the nature of the metal and the ligands involved. Some coordination compounds can be colorless.
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Q7. Which of the following statements is true about coordination compounds? (2021) 2021
Solution:
Coordination compounds can exhibit optical isomerism due to the arrangement of ligands around the central metal ion.
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Q8. What is the hybridization of the central metal ion in [Cr(NH3)6]3+? (2020) 2020
Solution:
In [Cr(NH3)6]3+, the hybridization is d2sp3 due to the octahedral arrangement of six ligands.
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Q9. Which of the following complexes is paramagnetic? (2023) 2023
Solution:
[Fe(H2O)6]3+ has unpaired electrons, making it paramagnetic, while the others have all paired electrons.
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Q10. In the complex ion [Fe(CN)6]3-, what is the oxidation state of iron? (2023)
Solution:
In [Fe(CN)6]3-, the CN- ligand has a charge of -1 and there are six CN- ligands. Therefore, the total negative charge is -6. To balance the -6 charge with the overall -3 charge of the complex, the oxidation state of iron must be +3.
