1a) Which of the following has the lowest vapour pressure at a fixed temperature?
(a) H2Se
(b) AsH3
(c) N2H4
(d) PH3
(e) NH3
1b) An end-centered orthorhombic unit cell has a cereal-box shape with atoms at each corner and on the face of two opposite ends. How many atoms are in a unit cell?
(a) 1
(b) 2
(c) 4
(d) 10