2.The main procedures for determining the H₂SO₄ content in concentrated sulfuric acid include:
①Measuring a certain volume of concentrated sulfuric acid and diluting it;
②Transferring the solution to a volumetric flask and diluting to a fixed volume;
③Pipetting 20.00 mL of the solution to be tested and titrating it with 0.10 м NaOH solution.
Which of the following pieces of apparatus is NOT required for the above procedures?
(A)
(B)
(C)
(D)
(E)

1. Compound A has the molecular formula C5H10, and all of its hydrogen atoms are chemically equivalent. Upon chlorination, A forms a dichlorinated product with the formula C5H8Cl2. Ignoring optical isomers, how many distinct isomers of C5H8C2 are possible? (A) 3 (B) 4 (C) 5 (D) 6 (E) 7

3. Arrange the following compounds in order of decreasing normal boiling point: ①neopentane ②1-pentanol ③n-pentane ④3-chloropentane⑤ pentanoic acid (A)⑤＞④>② ＞ ③ (B) ② ＞ ⑤ ＞① ＞ ③(C) ⑤ ＞ ② ＞ ①＞④ (D) ⑤＞④ ＞① ＞③ (E) ② ＞④＞ ③ ＞ ①

4. Galium-68 has been used for Positron Emission Tomography (PET) through a beta plus decay to generate a positron (β+), which annihilate with an ordinary electron to generate two gamma rays are emitted in opposite directions. Which of the following is the product for the β+ decay of the Galium-68? (A) Zn-68 (B) Ga-67 (C) Ge-69 (D) Zn-67 (E) Ge-68

5. Galium-68 has a half-life of 68 min for positron decay. The recommended amount of Galium-68 radioactivity to be administered for positron emission tomography (PET) imaging is 2 MBq/kg at the time of injection. If a freshly prepared Galium68 tracer solution has 64 MBq/mL, and it takes 3.5 hours to transport and ready for injection to patient. What volume of Galium-68 solution is required for PET scan on a 70-kg patient? (A) 5.6 mL (B) 7.5 mL (C) 11.6 mL (D) 14.2 mL (E) 17.5 mL

6. The basic building blocks of nucleic acids HC are nucleotides. The figure on the right shows a fragment of a nucleic acid structure. Which of the following statements is NOT correct? (A) DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) contain the same nitrogenous bases, but their five-carbon sugars are different. H 0 -O -CH OH (B) A nitrogenous base condenses with a five-carbon sugar to form anucleoside; a nucleoside condenses with phosphoric acid to form a nucleotide; nucleotides undergo condensation polymerization to form a nucleic acid. (C) Under certain conditions, a nucleotide can react with both acids and bases. (D) In nucleic acid molecules, bases undergo complementary pairing through hydrogen bonding. (E) This nucleic acid fragment contains three chiral centers. 

7. A galvanic cell is constructed based on the following standard reduction potentials at 25 °C:La3+ +3e-→La E° = -2.37 VFe2+ +2eFe E° = -0.44 V Which of the following statements is correct? (Faraday constant is 96500 C/mol.) (A) The cell potential with all components in their standard state is 3.42 V. (B) The cathode compartment would be composed of La3+/La. (C) Three electrons are transferred per unit of cell reaction. (D) When [Fe2+] = 2.00 x 10-4M and [La³+] = 2.00 x 10-3 M, the cell potential is ＞1.93 V. (E) The △G° for this cell is -1117.5 kJ.

8. Progesterone is a key female hormone with the structure on the right. Which of the following statements about this structure is correct?(A) It has two n-bonds. (B) It has six chiral carbon atoms. (C) Three carbon atoms are sp² hybridized. (D) Both oxygen atoms are sp hybridized. (E) It has two lone pairs of electrons in the Lewis structure. R

9. Which of the substances listed below can be transformed in nature according to the pathway shown in the diagram on the right, and for which substance R can react directly with water to form M?

10. Three possible Lewis structures (①, 2 and ③) can be drawn for nitrous oxide (N2O). Which of the following statements regarding N₂O and its Lewis structures is correct? (A) The oxidation state of nitrogen in N2O is +2. (B) The formal charge on the oxygen atom is the same in all three Lewis structures. (C) Based on formal-charge considerations, ①is the most fayorable. (D) Based on formal-charge considerations, ② is the most favorable. (E) The terminal nitrogen atom in ③ is sp-hybridized.

11. Pt(NH3)2Cl₂ has two isomers,① and② , as shown in the figure below. Compound① is called cisplatin, and compound ②is called transplatin. One of them is an anticancer drug, and one is inactive. The anticancer drug works by its chloride ions undergoing a substitution Cl NH3 CI NH reaction with nitrogen atoms in DNA Pt Pt that are close together, forming a N-Pt-N angle of about 90°. Which of the following statements regarding the  structures and properties of isomers ①and ② is correct? (A) The types of chemical bonds present in Pt(NH3)2C2 are coordinate (dative) bonds and ionic bonds. (B) The d-orbital splitting patterns of the metal center in① and② are identical. (C) Compound ② is the anticancer drug. (D)① and② have identical polarity. (E) IR spectroscopy can be used to distinguish between ① and②.

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