11. Statistics shows that wedding spending declines when the economic prospect is gloomy negative. Which of the following statements is correct?
(A) Wedding events are a normal good.
(B) Wedding events are an inferior good.
(C) Wedding events are a Giffen good.
(D) Wedding events are a superior good.

12. Wedding events are not mandatory because couples can simply marry at the district offices. Based on the observation, wedding events are (A) a luxury good and their income elasticity of demand is greater than 1 (B) a luxury good and their income elasticity of demand is less than 1 (C) a necessity good and their income elasticity of demand is greater than 1 (D) a necessity good and their income elasticity of demand is less than 1

13. What is his expected wealth and utility respectively? (A) $3,000, 120 (B) $2,000, 90 (C) $3,000, 90 (D) $2,000, 60

14. Arendelle Capital, an insurance company, is willing to sell Kristoff cold-summer insurance and promises to pay him $5,000 if the summer is cold and the business fails. Is Kristoff willing to pay $1,000 for the insurance? Is Kristoff willing to pay $2,000 for the insurance? (A) Kristoff is willing to pay $1,000, even $2,000 for the insurance. (B) Kristoff is only willing to pay $1,000, not $2,000 for the insurance. (C) It is not worth it for Kristoff to purchase either insurance. (D) There is no way that an insurance company can lower the risk for Elsa to start snow storms, so it is not worth it for Kristoff to purchase any insurance.

1. Given that dH = TdS + Vdp and that G = H - TS，which of the following is true? (A) dG = TdS - VdP (B) dG = dH - SdT (C)dG = -SdT + Vdp (D) dG = dH - TdS

2. Which of the following is zero for an ideal gas? (A) $\left(\frac{\partial H}{\partial T}\right)_p$ (B) $\left(\frac{\partial U}{\partial T}\right)_v$ (C) $\left(\frac{\partial V}{\partial T}\right)_p$ (D) $\left(\frac{\partial H}{\partial p}\right)_T$

3. What is the wavelength of the photon emitted from 2p to 1s of a hydrogen atom? (The Rederberg constant is $1.097 \times 10^5 cm^{-1}$) (A) 91.1 nm (B) 121.6 nm (C) 364.6 nm (D) 486.1 nm

4. What is the unit of the rate constant of a third-order reaction? (A) no unit (B) $t^{-1}$ (C) $M^{-1}t^{-1}$ (D) $M^{-2}t^{-1}$

5. Which of the following molecules has unpaired electron(s) in the electronic ground state? (A) O$_2$ (B) N$_2$ (C) H$_2$ (D) Cl$_2$

6. What is the orbital angular momentum of an electron in the 4d orbital? (A) $\sqrt{2} \hbar$ (B) $\sqrt{6} \hbar$ (C) $\sqrt{12} \hbar$ (D) $\sqrt{20} \hbar$

7. How many vibrational modes does an SO$_2$ molecule have? (A) 3 (B) 4 (C) 5 (D) 6

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