5 items multiple choice
35. What is the oxidation number of chlorine in HClO4?
A. +1 B. +6 C. +7 D. -8
36. How many electrons were lost/gained in the following
2K2Cr2O7 + 2H2O + 3S 4KOH + 2Cr2O3 + 3SO2?
A. 2 B. 3 C. 6 D. 12
37. In the reaction, Fe2+ + Cr2O72- Fe3+ + Cr3+, which is involved in oxidation?
A. Fe B. Cr2O7 C. Cr D. O
38. Which of the following half reactions in CORRECT?
A. I2 + 1e- I- B. Cu2+ + 2e- Cu+ C. Zn2+ + 2e- Zn D. 2H+ + 2e- H2-
39. The following are examples of spontaneous reactions EXCEPT
A. Water freezes spontaneously below 0ᵒC, and ice melts spontaneously above 0ᵒC. B. Heat flows from a colder one but reverse happens spontaneously.
C. A waterfall runs downhill, but never up spontaneously.
D. A lump of sugar spontaneously dissolves in a cup of coffee, but dissolved sugar does not spontaneously reappear in its original form.
40. For an equilibrium process, the free-energy change ∆G is
A. less than zero. B. greater than zero. C. equal to zero. D. equal to one.
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