1) Which of the following salts (high spin for paramagnetic samples) will have the strongest attraction to a magnet?
A. MnSO4 B.CoSO4 C.ZnSO4 D.CaSO4.
2) If V(CO)6 is an 18-electron complex, what is the charge on the complex, if any?
A. +2; B.+1; C.0; D.-1
3) In a metal carbonyl complex, as more electron density moves from the metal d-orbitals to the CO p* orbital (d --> p*), what happens to the CO bond order?
A. it increases B.it decreases C.it stays the same.
4) Photo-excitation promotes an electron from the HOMO (highest occupied molecular orbital) to the LUMO (lowest unoccupied molecular orbital) of a molecule.
i.Which is the stronger oxidant?
A.ground state - GS; B.excited state - ES C.GS is as oxidant as the excited one
iiWhich is the stronger reductant?
A.ground state - GS B.excited state - ES C.GS is as reductant as the excited one
5) Although pure diamonds are colorless, some diamonds have color because of dopants. The Hope diamond, for example, is blue due to nitrogen (N) dopants. Based on its position in the periodic table, N in diamond acts as a(n):
A.neither donor nor acceptor B.donor C.acceptor
6.For the reaction [Fe2O3 (s) + 3/2 C (s) –> 2 Fe (s) + 3/2 CO2 (g)] DH at 300 K is 233.8 kJ while DS is 279.16 J´K–1. Assuming no change in either quantity with temperature, the temperature at which this reaction becomes spontaneous is about
A. 1 K B. 800 K C.1000 K D.1200 K
7. The rate of chemical reaction depends on the total number of collision between reactant molecules. The total number of collision is favored by
(A) smaller collision cross section and low molecular velocity;
(B) smaller collision cross section and high molecular velocity;
(C) larger collision cross section and low molecular velocity;
(D) larger collision cross section and higher molecular velocity.
8) In heterogeneous catalysis of reactions on solid surfaces, the effectiveness of a given catalyst is not determined by
(A) bulk density of the catalyst;
(B) surface roughness of the catalyst;
(C) number of active sites on the catalyst surface;
(D) degree of adsorption of the reactant on the catalyst surface.
