The d- and f- Block Elements MCQs Mock Test of Class 12th Chemistry

Question 1. A developer used in photography is

Question 2. Which of the following compounds, on reaction with NaOH and Na2O2, gives yellow colour?

Question 3. The electronic configuration of actinides cannot be assigned with degree of certainty because of

Question 4. MnO4– is of intense pink colour, though Mn is in +7 oxidation state. It is due to

Question 5. Among the following series of transition metai ions, the one in which all metal ions have 3 d2– electronic configuration is (Atomic number: Ti= 22, V= 23, Cr= 24, Mn= 25)

Question 6. Which one of the following ions is the most stable in aqueous solution? (Atomic number: Ti = 22, V=23, Cr = 24, Mn = 25).

Question 7. Which of the following element has maximum first ionisation potential?

Question 8. Mercury is a liquid metal because

Question 9. Which of the following compounds volatises on heating?

Question 10. Among of the following outermost configurations of transition metals, which shows the highest oxidation state?

Question 11. Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?

Question 12. Among the following pair of ions, the lower oxidation state in aqueous solution is more stable then the order is

Question 13. Which oxide of manganese is amphoteric?

Question 14. Which one of the following oxides is ionic?

Question 15. The basic character of the transition metal monoxides follows the order

Question 16. Which of the following is highly corrosive?

Question 17. Which of the following is amphoteric oxide? Mn2O7, CrO3, Cr2O3, CrO, V2O5, V2O4

Question 18. Paramagnetism is given by the relation μ= 2√[S(S +1)] magnetons where ‘S is the total spin. On the basis, the paramagnetism of Cu+ ion is

Question 19. Which of the following ions form most stable complex compound?

Question 20. Among the following, compound that is both paramagnetic and coloured is

Question 21. Amongst the following, the lowest degree of paramagnetism per mole of the compound at 298 K will be shown by

Question 22. Which of the following has highest magnetic moment?

Question 23. The spin only magnetic moment of Mn4+ ion is nearly

Question 24. Amongst TiF2-6, CoF3-6, Cu2Cl2 and NiCl2-4, the colourless species are (atomic number Ti =22, Co = 27, Cu = 29, Ni = 28)

Question 25. Cuprous ion is colourless, while cupric ion is coloured because

Question 26. The catalytic activity of the transition metals and their compounds is ascribed to their

Question 27. Acidified potassium permanganate solution is decolourised by

Question 28. With K4[Fe(CN)6],Cu2+ ions give

In the above reaction, X is

Question 30. On igniting Fe2O3 at 1400°C, the product obtained is

Question 31. Acidified solution of potassium dichromate on treatment with H2O2 yields

Question 32. Gadolinium belongs to 4f-series, atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

Question 33. There are 14 elements in actinoid series. Which of the following elements does not belong to this series?

Question 34. Which of the following trivalent ion has the largest atomic radii in the lanthanide series?

Question 35. Arrange Ce3+, La3+, Pm3+ and Yb3+ in increasing order of their ionic radii.

Question 36. Identify the incorrect statement among the following.

Question 37. More number of oxidation states are exhibited by the actinoids than by lanthanoids. The main reason for this is

Question 38. The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is bacause

Question 39. The point of dissimilarity between lanthanides and actinides is (a) three outermost shells are partially filled (b) they show oxidation state of +3(common) (c) they are called inraer transition elements (d) they are radioactive in nature

Question 40. In context of the lanthanoids, which of the following statements are correct?

Question 41. The number of d- electrons in Fe2+(Z =26) is not equal to the number of electrons in which one of the following?

Question 42. Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).

Question 43. Magnetic moment 2.84 BM is given by: (Atomic number of Ni =28, Ti =22, Cr =24, Co=27)

Question 44. Reason of lanthanoid contraction is

Question 45. KI and CuSO4 solution when mixed, give

Question 46. A magnetic moment of 1.73 BM will be shown by one among the following.

Question 47. Identify the correct order of solubility in aqueous medium

Question 48. Which of the following lanthanoid ions is diamagnetic? (Atomic numbers :Ce=58, Sm=62, Eu=63, Yb=70)

Question 49. Which of the following statements about the interstitial compounds is incorrect?

Question 50. Identify the alloy containing a non-metal as a constituent in it.