Class 12 Chemistry - d and f Block Question Paper PDF

Class 12 Chemistry - d and f Block Question Paper Time Allowed: 3 Hours | Maximum Marks: 90 Section A: Multiple Choice Questions (1 x 20 = 20 Marks) 1. Which of the following is a transition element? a) Calcium b) Scandium c) Potassium d) Argon 2. The general electroni...

Class 12 Chemistry - d and f Block Question Paper Time Allowed: 3 Hours | Maximum Marks: 90 Section A: Multiple Choice Questions (1 x 20 = 20 Marks) 1. Which of the following is a transition element? a) Calcium b) Scandium c) Potassium d) Argon 2. The general electronic configuration of d-block elements is: a) (n-1)d^(1-10) ns^(0-2) b) (n-2)f^(1-14) ns^(0-2) c) ns^2 np^6 d) (n-1)p^(1-6) ns^(2) 3. Which oxidation state is most common for d-block elements? a) +1 b) +2 c) +3 d) +4 4. The catalytic properties of d-block elements are due to: a) Variable oxidation states b) High melting points c) Metallic bonding d) Low ionization energy 5. Which element has the highest melting point in the d-block? a) Iron b) Tungsten c) Copper d) Zinc 6. Which of the following ions is colored? a) Ti^4+ b) Sc^3+ c) V^3+ d) Zn^2+ 7. The color of KMnO4 is due to: a) d-d transition b) Charge transfer transition c) Ionization energy d) Electron affinity 8. The lanthanoid contraction is responsible for:  a) Similar radii of Zr and Hf b) High density of lanthanoids c) Low melting point of lanthanoids d) None of these 9. Which of the following is a property of f-block elements? a) High ionization enthalpy b) Act as good reducing agents c) Poor thermal conductors d) None of these 10. Which of the following is used in nuclear reactors? a) Uranium b) Thorium c) Plutonium d) All of these 11. What is the oxidation state of Mn in MnO4^-? a) +3 b) +5 c) +7 d) +4 12. Which of the following is a member of the actinide series? a) Cerium b) Neptunium c) Europium d) Ytterbium 13. Which of the following is paramagnetic? a) Zn^2+ b) Cu^+ c) Ni^2+ d) Sc^3+ 14. What is the primary reason for the stability of Cr^3+? a) High electronegativity b) Half-filled d-orbitals c) Low ionization energy d) Small atomic size 15. The atomic number of the first element of the 5d series is: a) 39 b) 57 c) 72 d) 90 16. Which element shows +4 oxidation state in the f-block? a) Cerium  b) Thorium c) Uranium d) Plutonium 17. Which of the following has the highest first ionization energy? a) Copper b) Zinc c) Nickel d) Iron 18. Which of the following is a strong oxidizing agent? a) KMnO4 b) K2Cr2O7 c) Both a and b d) None of these 19. Which is the most stable oxidation state of lanthanoids? a) +2 b) +3 c) +4 d) +5 20. Which element forms an amalgam? a) Zinc b) Silver c) Mercury d) Lead Section B: One-Word Answer Questions (1 x 10 = 10 Marks) 1. Name the transition metal used in making stainless steel. 2. Which d-block element is used in thermometers? 3. What is the color of hydrated copper sulfate? 4. Which block do lanthanoids and actinoids belong to? 5. Which d-block element is present in hemoglobin? 6. What is the atomic number of Uranium? 7. Which transition element is used as a catalyst in the Haber process? 8. Name one property of transition metals responsible for their use in making alloys. 9. Which f-block element is used in cancer treatment? 10. Which transition metal is used in coinage metals? Section C: Short Answer Questions (2 x 10 = 20 Marks) 1. Explain the cause of color in transition metal compounds. 2. Why are transition metals often good catalysts? 3. State the general electronic configuration of f-block elements. 4. What is the lanthanoid contraction? Give its consequences. 5. Why do d-block elements form complex compounds? 6. Why is Cr^3+ more stable than Cr^2+? 7. What are interstitial compounds? Give an example. 8. How does the oxidation state vary across the d-block series? 9. What is the significance of the actinide series? 10. Why is zinc not considered a transition element? Section D: Long Answer Questions (4 x 10 = 40 Marks) 1. Discuss the properties and uses of KMnO4 as an oxidizing agent. 2. Explain the trends in ionization enthalpy across the d-block elements. 3. Write the preparation and properties of potassium dichromate. 4. Explain why f-block elements show variable oxidation states. 5. Discuss the similarities and differences between lanthanoids and actinoids. 6. Describe the catalytic behavior of transition metals with examples. 7. Explain the magnetic properties of d-block elements. 8. Discuss the applications of lanthanoids in modern industries. 9. Describe the preparation and uses of lanthanum oxide. 10. Explain why transition metals form colored compounds with examples.