18. The triple point of CO₂ is at 5.2 atm and −57 °C. Under a typical atmospheric condition in Yushan (P = 481 torr, T = 3.8 °C), a sample of dry ice (solid CO₂) will (A) melt (B) boil (C) sublime (D) remain solid (E) none of the above

8. Which of the following statements about the complex ion [Co(en)₂Cl₂]⁺ is correct? (en = ethylenediamine)(A) It has two geometric isomers and two optical isomers.(B) Since en is a strong field ligand, the complex ion is paramagnetic.(C) It has cis and trans geometric isomers, but no optical isomers.(D) The geometric isomers of it have similar properties.(E) The oxidation state of Co is +1.

18. The triple point of CO₂ is at 5.2 atm and −57 °C. Under a typical atmospheric condition in Yushan (P = 481 torr, T = 3.8 °C), a sample of dry ice (solid CO₂) will

(A) melt

(B) boil

(C) sublime

(D) remain solid

(E) none of the above

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