(Chemistry) CBSE Class XII Important Questions Chemistry (2008)
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Chemistry : CBSE Class XII Important Questions Chemistry (2008)
Q. 1. Zn, Cd and Hg are not considered as transition metals.
Q. 2. Cu,Ag &Au are considered as transition metal though it has 3d,10 configuration.
Q. 3. Zn, Cd and Hg are volatile and Hg is a liquid metal.
Q. 4. Transition metals have high enthalpy of atomisation.
Q. 5. 4d and 5d elements have higher enthalpy of atomisation than 3d elements.
Q. 6. Density of 3d elements increases from Sc to Ni.
Q. 7. Atomic and ionic radii generally decrease along the period.
Q. 8. Zr and Hf have similar size.
Q. 9. Transition metals do not show regular variation of ionisation enthalpies.
Q. 10. 5d elements have higher ionisation enthalpy than 3d and 4d elements.
Q. 11. Generally first ionisation enthalpy increases along the period.
Q. 12. Cr &Cu has higher second ionisation enthalpy (Cr = 24,Cu = 29)
Q. 13. Mn &Zn has higher 3rd ionisation enthalpy (Mn = 25 Zn = 30)
Q. 14. Cu, Ni and Zn normally do not exhibit oxidation state higher than +2.
Q. 15. Transition metals show variable oxidation state.
Q. 16. Transition metals do not show regular variation of E0 values.
Q. 17. E0 Mn3+/Mn2+ have higher +ve value than E0 Cr3+/Cr2+.(Cr=24 Mn=25).
Q. 18. E0 Zn2+/Zn has higher – value. ( Zn = 30).
Q. 19. Transition metals form complexes easily.
Q. 20. Transition metals act as catalysts.
Q. 21. Transition metal compounds are paramagnetic.
Q. 22. Sc3+,Cu+ and Zn2+ are diamagnetic .Sc=21 Cu=29 Zn=30).
Q. 23. Oxidation state of transition metals increases by one unit.
Q. 24. E0 Ni2+/Ni has higher – ve value.
Q. 25. Transition metal compounds are coloured.
Q. 26. Sc3+, Cu+ and Zn2+ are colourless .[Sc = 21 Cu = 29 Zn = 30].
Q. 27. Transition metals form interstitial compounds easily.
Q. 28. Transition metals form alloys easily.
Q. 29. Higher oxides of transition metals are acidic.
Q. 30. Enthalpy of atomization of transition metals reaches a maximum in the middle of each series
Q. 31. Lanthanoid ions are coloured and paramagnetic.
Q. 32. La3+ and Lu3+ are colourless and diamagnetic. (La=57 Lu=71).
Q. 33. Ln are paramagnetic.
Q. 34. La3+ is diamagnetic.
Q. 35. Ce is stable in +4 oxidation state. E0 Ce4+/Ce3+ has higher positive value.