12th Chemistry Important Questions Unit 4 Transition And Inner Transition Elements

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12th Chemistry All Units Important Questions

12th Chemistry Important Questions

Chapter 4 Transition And Inner Transition Elements

• 1. What are transition metals? Give four examples.
• 2. Explain the oxidation states of 3d series elements.
• 3. What are inner transition elements?
• 4. Justify the position of lanthanides and actinides in the periodic table.
• 5. What are actinides? Give three examples.
• 6. Why Gd⁺³ is colourless?
• 7. Explain why compounds of Cu⁺³ are coloured but those of Zn⁺² are colourless.
• 8. What is lanthanide contraction and what are the effects of lanthanide contraction?
• 9. What are interstitial compounds?
• 10. Calculate the number of unpaired electrons in Ti³ , Mn² and calculate the spin only magnetic moment.
• 11. Write the electronic configuration of Ce⁴⁺ and Co²⁺.
• 12. Explain briefly how +2 states becomes more and more stable in the first half of the first row transition elements with increasing atomic number.
• 13. Which is more stable? Fe³⁺ or Fe²⁺ – explain.
• 14. Explain the variation in E⁰M3+/M2+ 3d series.
• 15. Compare lanthanides and actinides.
• 16. Explain why Cr²⁺ is strongly reducing while Mn³⁺ is strongly oxidizing.
• 17. Compare the ionization enthalpies of first series of the transition elements.
• 18. Actinoid contraction is greater from element to element than the lanthanoid contraction, why?
• 19. Out of Lu(OH)₃ and La(OH)₃ which is more basic and why?
• 20. Why europium (II) is more stable than Cerium (II)?
• 21. Why do zirconium and Hafnium exhibit similar properties?
• 22. Which is stronger reducing agent Cr²⁺ or Fe²⁺?
• 23. The E0M2+/M value for copper is positive. Suggest a possible reason for this.
• 24. Predict which of the following will be coloured in aqueous solution Ti²⁺, V³⁺, Sc⁴⁺, Cu+, Sc³⁺, Fe³⁺, Ni²⁺and Co³⁺
• 25. Describe the variable oxidation state of 3d series elements.
• 26. Which metal in the 3d series exhibits +1 oxidation state most frequently and why?
• 27. Why first ionization enthalpy of chromium is lower than that of zinc?
• 28. Transition metals show high melting points why?
• 29. Show that potassium permanganate is an oxidising agent
• 30. Give the use of Zeigler – Natta catalyst
• 31. Write difference between para and dia magnetic property
• 32. In the first series of transistion elements, the atomic radius of Zinc is high – why?
• 33. How does atomic radius of Transistion elements vary across a Period and down a Group?
• 34. What are Transistion elements and discuss the position in the periodic table.?
• 35. Define Hume-Rothery rule for alloy formation.
• 36. Why transistion elements form alloys ?
• 37. State Standard electrode potential.

12th Chemistry All Units Important Questions