Q. In the complex ion [Fe(CN)6]3-, what is the oxidation state of iron? (2023)
A.
0
B.
+2
C.
+3
D.
+4
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.
Q. What is the oxidation state of chromium in K2Cr2O7? (2021) 2021
A.
+3
B.
+6
C.
+2
D.
+5
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.
Q. Which of the following statements about coordination compounds is incorrect? (2023)
A.
They can exhibit geometric isomerism.
B.
They can exhibit optical isomerism.
C.
All coordination compounds are colored.
D.
They can form complexes with transition metals.
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.
Correct Answer:
C
— All coordination compounds are colored.
Coordination compounds play a crucial role in chemistry, especially for students preparing for school and competitive exams. Understanding this topic not only enhances your conceptual clarity but also boosts your confidence in solving MCQs and objective questions. Practicing these questions is essential for scoring better in exams, as they often feature important questions that test your grasp of key concepts.
What You Will Practise Here
Definition and classification of coordination compounds.
Key terms such as ligands, coordination number, and chelation.
Common coordination compounds and their applications.
Isomerism in coordination compounds, including geometric and optical isomers.
Crystal field theory and its implications on the properties of coordination compounds.
Important reactions involving coordination compounds.
Numerical problems related to coordination chemistry.
Exam Relevance
Coordination compounds are a significant part of the chemistry syllabus for CBSE, State Boards, NEET, and JEE. Students can expect questions that assess their understanding of definitions, properties, and applications of these compounds. Common question patterns include multiple-choice questions that require you to identify ligands, predict the geometry of complexes, and solve problems based on crystal field splitting energy.
Common Mistakes Students Make
Confusing between different types of ligands and their classifications.
Misunderstanding the concept of coordination number and its significance.
Overlooking the importance of isomerism in coordination compounds.
Failing to apply crystal field theory correctly to predict the behavior of complexes.
FAQs
Question: What are coordination compounds? Answer: Coordination compounds are complex structures formed by the coordination of metal ions with ligands, which can be ions or molecules that donate electron pairs.
Question: How do I prepare for MCQs on coordination compounds? Answer: Focus on understanding key concepts, practicing objective questions, and reviewing important definitions and theories related to coordination compounds.
Now is the time to enhance your preparation! Dive into our practice MCQs on coordination compounds and test your understanding to excel in your exams.
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