47. Oxidation of 2-methyl-1-butanol could yield
I: 2-methyl-1-butanone； II: 2-methylbutanal； III: 2-methylbutanoic acid
(A) I only
(B) II only
(C) III only
(D) II and III
(E) I and III

48. Which statement is true?.(A) protein synthesis takes place in the cytoplasm of the cell (B) each gene in the DNA molecule codes for aspecific protein (C) messenger RNA can be found in both the nucleus and the cytoplasm of each cell (D) when apeptide bond is formed, H2O is produced. (E) all of these statements are true.

49. Teflon is an example of a(A) copolymer (B) homopolymer (C) dimer (D) two of these (E) none of these

50. A protein is(A) polysaccharide (B) a saturated ester of glycerol (C) one of the units composing a nucleic acid (D) a polymerof amino acid units (E) an aromatic hydrocarbon with a fused ring structure

1. Vitamin C contains the elements C, H, and O. It is known to contain 40.9% C and 4.58% H by mass. The molar mass of vitamin C has been found to be about 180. The molecular formula for vitamin C is (A) C2H3O2 (B) C3H4O3 (C) C4H6O4 (D) C6H8O6 (E) none of these

2. When the equation FeCr2O4 + K2CO3 + O2 → K2CrO4 + Fe2O3 + CO2 is balanced with the smallest set of integers, the sum of the coefficients is (A) 6 (B) 9 (C) 15 (D) 24 (E) 37

3. The following acids are listed in order of decreasing acid strength in water. HI ＞ HNO2 ＞ CH3COOH ＞ HCIO ＞ HCN According to Brønsted-Lowry theory, which of the following ions is the weakest base? (A) (B) (C) (D) (E)

4. The strong acid HA is added to water. Which of the following is the strongest base in the system? (A) HA (B) H2O (C) (D) (E)

5. The acids HC2H3O2 and HF are both weak, but HF is a stronger acid than HC2H3O2. HCI is a strong acid. Order the following according to base strength. (A) (B) (C) (D) (E) none of these

6. The two salts AgX and AgY have very similar solubilities in water. The salt AgX is much more soluble in acid than is AgY. What can be said about the relative strengths of the acids HX and HY? (A) nothing can be said about their relative strengths (B) HY is stronger than HX (C) HX is stronger than HY (D) the acids have equal strengths (E) none of these

7. For the combustion of ethyl alcohol as described in the above equation, which of the following statements is(are) true? C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(Λ), ΔΗ = −1.37 x 103 kJ I: The reaction is exothermic； II: The enthalpy change would be different if gaseous water were produced； III: The reaction is not an oxidation-reduction one； IV: The products of the reaction occupy a larger volume than the reactants. (A) I, II (B) I, II, III (C) I, III, IV (D) III, IV (E) I only

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