1. What is the symmetry point group for cis-PtBr$_2$Cl$_2$$^{-2}$? (Hint: square planar) (3 points)
(A) D$_{2h}$?
(B) C$_{2v}$?
(C) C$_{2h}$?
(D) D$_{4h}$?
(E) C$_1$.

2. For N$_2$, the following molecular orbital is described as: (3 points) (A) $\sigma_p$? (B) $\sigma_{p^*}$? (C) $\pi$? (D) $\pi^*$? (E) $\sigma_{\pi^*}$

3. Which of the following is not expected to exist according to molecular orbital theory? (3 points) (A) H$_2$? (B) He$_2$? (C) H$_2$? (D) He$_2$? (E) Be$_2$?

4. In which case would the equilibrium be expected to lie to the right? (3 points) □□□□□ (A) \( \mathrm{MgF_2 + HgI_2\rightleftharpoons MgI_2 + HgF_2} \) (B) \( \mathrm{AgBr} + \mathrm{NaCl}\rightleftharpoons \mathrm{AgCl} + \mathrm{NaBr} \) (C) \( \mathrm{Hg_2I_2 + MgF_2\rightleftharpoons Hg_2F_2 + MgI_2} \) (D) \( \mathrm{CuO} + 2\mathrm{Cu}_{2}\mathrm{S}\rightleftharpoons \mathrm{CuS} + 2\mathrm{Cu}_{2}\mathrm{O} \) (E) \( \mathrm{CdCl}_2 + \mathrm{K}_2\mathrm{S} \rightleftharpoons \mathrm{CdS} + 2\mathrm{KCl} \)

5. Which of the following complex does not obey the 18-electron rule? (3 points) (A)(B)(C)(D)

6. Which of the following complex has the lowest energy of CO stretching frequency in the IR region (3 points)? (A) $[\mathrm{V}(\mathrm{CO})_6]^+$ (B) $\mathrm{Cr}(\mathrm{CO})_6$ (C) $[\mathrm{Mn}(\mathrm{CO})_6]^+$ (D) $\mathrm{Fe}(\mathrm{CO})_5$

7. Which of the following is an example of lattice energy? (3 points) (A) \( \mathrm{M}^{+n}(\mathrm{g}) + n\mathrm{X}^{-}(\mathrm{g})\longrightarrow \mathrm{MX}_{n}(\mathrm{g}) \) (B) \( \mathrm{M}^{+n}(\mathrm{g}) + n\mathrm{X}^{-}(\mathrm{g})\longrightarrow \mathrm{MX}_{n}(\mathrm{s}) \) (C) \( \mathrm{MX}_n(\mathbf{s})\longrightarrow \mathrm{M}^{+n}(\mathbf{g}) + n\mathrm{X}^{-}(\mathbf{g}) \) (D) \( \mathrm{MX}_n(\mathbf{g})\longrightarrow \mathrm{M}^{+n}(\mathbf{g}) + n\mathrm{X}^{-}(\mathbf{g}) \) (E) \( M(s) + n / 2X_{2}(g)\longrightarrow MX_{n}(s) \)

8. A p-type semiconductor might consist of a lattice of silicon with a trace of (3 points) (A) gallium. (B) $\mathrm{Na}^+$ . (C) phosphorus (D) potassium metal(E) copper, silver or gold

9. Which would have the largest crystal field stabilization energy? (3 points) (A) octahedral complex with \( d^3 \) configuration (B) octahedral complex with \( d^4 \) low spin configuration (C) tetrahedral complex with \( d^5 \) configuration (D) octahedral complex with \( d^6 \) low spin configuration (E) octahedral complex with \( d^6 \) high spin configuration

10. In which of compounds is the one most likely to be high spin listed first? (3 points) (A) \( \mathrm{Ru(H_2O)_6^{+3}} \) and \( \mathrm{Fe(H_2O)_6^{+3}} \) (B) \( \mathrm{Mn(Cl)_6^{-3}} \) and \( \mathrm{Mn(Cl)_6^{-4}} \) (C) \( \mathrm{Fe(Cl)_6^{-3}} \) and \( \mathrm{Fe(Cl)_4^-} \) (D) \( \mathrm{Ni(NH_3)_4^{+2}} \) and \( \mathrm{Pt(NH_3)_4^{+2}} \) (E) \( \mathrm{Fe(CN)_6^{-3}} \) and \( \mathrm{Fe(H_2O)_6^{+3}} \)

11. The number of unpaired electrons in $\mathrm{K}_4[\mathrm{Co}(\mathrm{CN})_6]$ is: (3 points) (A) 0 (B) 1 (C) 2 (D) 3 (E) None of these

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