德布勒森大学本科申请入学考试（化学试题参考）(2)
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(D) Reduction of chloride occurs. (E) Oxidation of aluminium occurs.
19. Which of the following substances has the lowest melting point?
(A) propane (B) propanol (C) propanoic acid
(D) propanal (E) propanone
20. A pH = 2 solution
(A) has a hydroxide concentration of 10–2 mol/dm3.
(B) has an H3O+ concentration of 10–12 mol/dm3.
(C) of acetic acid contains 0.01 mol/dm3 CH3COOH.
(D) of sulphuric acid contains 0.01 mol/dm3 H2SO4.
(E) of hydrochloric acid contains 0.01 mol/dm3 HCl.
