22. How many unpaired electrons are there in a ion?
(A) 2
(B) 3
(C) 4
(D) 5
(E) 6

23. Which of the following compounds is the strongest base in water? (A)B2O3(B) CO2(C)CI2O(D) K2O(E)

24. Which rotation symmetry operation is NOT allowed for the crystalline solid with 3D structure (A) 2 fold rotation (B) 3 fold rotation (C) 4 fold rotation (D) 5 fold rotation (E) 6 fold rotation

25. How many Nat cations in an unit cell of NaCl crystal structure? (A) 1(B) 2 (C) 3 (D)4 (E) 5

26. Given phosphine-I2 (Ar3P-I2) adducts and the correlations between their P-I and I-I bond lengths are shown below. How many of following statement(s) is/are correct? (i) Phosphines forms Lewis acid-base adducts with I2, in which phosphines are Lewis base and I2 is Lewis acidic. (ii) Generally, stronger phosphine donors result in the Ar3P-I2 adduct with shorter I-I bond length. (ili) The I-I bond lengthening is attributed to the donation from phosphine ligands into π* orbitals of I2. (iv) The I-I bond lengths of Ar3P-I2 adducts are longer than that of I2. (v) Steric hindrance caused by the ortho-substituents does not influence the magnitude of the P-I and I-I bond lengths.   (A) 1 (B) 2 (C) 3(D) 4(E) 5

27. For ditungsten W2 molecule, what is the possible maximum bond order for it? (A) 3(B) 4 (C) 5(D) 6(E) 7

28. Following the Q27, what is the electron count for W in W2 molecule? (A) 10 (B) 12 (C) 14 (D) 16 (E) 18 

29. Assume that Hund's rule holds for all the systems considered in this problem, and L-S coupling is applicable for all systems. Which of the following has7S3 as its ground term? (A) V(B) Cr (C) Mn (D) Fe (E) Co

30. Which of the following ions or molecules do you expect to be paramagnetic? (A) [Fe(CO)5] (B) (C) [Cu(CH3CN)4)+ (D)(E)

31. Which of the following ions or molecules do you expect to be colorless? (A) [Fe(CO)5] (B) (C) [Cu(CH3CN)4]+ (D)(E)

32. What d orbital splitting diagram would you expect for Fe(CO)5 molecule? (A)(B)(C)(D)(E)

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