MCQ Test - Chemistry - PDF
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This document contains multiple-choice questions (MCQs) on coordination chemistry. The questions cover topics such as the colors of transition metal complexes, oxidation states, and the effects of ligands on complex formation. The questions are ideal for practicing and testing understanding of chemical concepts related to coordination chemistry.
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1. Which colour is observed for the [Cu(H₂O)₆]²⁺ complex? - A) Green - B) Blue - C) Yellow - D) Red - Answer: B) Blue 2. Which ligand causes the complex [CuCl₄]²⁻ to be formed from [Cu(H₂O)₆]²⁺? - A) NH₃ - B) EDTA⁴⁻ - C) H₂O - D) Cl⁻ - Answer: D) Cl⁻ 3. What is the colour change observed when exce...
1. Which colour is observed for the [Cu(H₂O)₆]²⁺ complex? - A) Green - B) Blue - C) Yellow - D) Red - Answer: B) Blue 2. Which ligand causes the complex [CuCl₄]²⁻ to be formed from [Cu(H₂O)₆]²⁺? - A) NH₃ - B) EDTA⁴⁻ - C) H₂O - D) Cl⁻ - Answer: D) Cl⁻ 3. What is the colour change observed when excess NH₃ is added to [Cu(H₂O)₆]²⁺? - A) Blue solution to dark blue solution - B) Yellow solution to green solution - C) Green precipitate to brown precipitate - D) No change - Answer: A) Blue solution to dark blue solution 4. What is the oxidation state of vanadium in the ion [VO₂]⁺? - A) +2 - B) +4 - C) +5 - D) +6 - Answer: C) +5 5. What is the coordination number in the complex [Fe(H₂O)₆]³⁺? - A) 2 - B) 4 - C) 6 - D) 8 - Answer: C) 6 6. Which factor does NOT affect the colour of a transition metal complex? - A) Oxidation state of the central metal ion - B) Type of ligand bonded - C) Coordination number of the complex ion - D) Amount of metal ion - Answer: D) Amount of metal ion 7. Which complex ion has a deep blue colour when reacts with excess NH₃? - A) [Fe(H₂O)₆]³⁺ - B) [Cu(NH₃)₄(H₂O)₂]²⁺ - C) [FeCl₄]⁻ - D) [Ni(C₂O₄)₃]⁴⁻ - Answer: B) [Cu(NH₃)₄(H₂O)₂]²⁺ 8. What is the effect of adding concentrated HCl to [Fe(H₂O)₆]³⁺? - A) Deep blue solution to green solution - B) Yellow solution to purple solution - C) Yellow solution to yellow-green solution - D) No change - Answer: D) No change 9. Which ligand can act as a multidentate ligand and form a more stable complex? - A) NH₃ - B) H₂O - C) Cl⁻ - D) EDTA⁴⁻ - Answer: D) EDTA⁴⁻ 10. What is the observed colour for the [Fe(H₂O)₆]²⁺ complex? - A) Green - B) Red - C) Purple - D) Colorless - Answer: A) Green
