The Solution for GRE Chemistry Practice Test [01-20]
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1. Which of the following is the major product of the reaction shown below?
⑴ answer: D
⑵ Grignard reagent carbon-carbon coupling reaction
2. According to IUPAC rules, what is the name of the molecule shown below?
⑴ answer: E
3. Of the following, which has the smallest radius?
⑴ answer: C
⑵ The radius decreases as the atomic number increases when the number of electrons is constant.
⑶ In general, the radius increases as the number of shells increases.
4. The molecular geometry of thionyl chloride, SOCl2, is best described as
⑴ answer: D
⑵ The molecular geometry is based on VSEPR.
5. Which of the following is true of the cell represented below?
⑴ answer: A
⑵ The problem is based on electrochemistry.
⑶ oxidation: losing one or more electrons
⑷ reduction: getting one or more electrons
⑸ An oxidizing agent itself reduces.
⑹ A reducing agent itself oxidizes.
⑺ If ions are generated, they do neither oxidize nor reduce.
6. Of the following substances, which is likely to have the largest value of the coefficient a in the van der Waals equation of state for real gases shown below?
⑴ answer: D
⑵ Van der Waals equation of state
⑶ If the intermolecular attraction is more strong due to polarity, etc, the coefficient a is larger.
7. What is the orbital angular momentum quantum number, ℓ, of the electron that is most easily removed when ground-state aluminum is ionized?
⑴ answer: C
⑶ Al: 1s22s22p63s23p1
8. When the equation shown below is balanced, which of the follownig is true?
⑴ answer: B
⑵ determination of the reaction coefficients
⑶ 6MnO4- + 5I- + 18H+ → 6Mn2+ + 5IO3- + 9H2O
9. Which of the following is the major organic product of the reaction shown below?
⑴ answer: C
⑵ carboxylic acid reduction reaction
⑶ The reaction goes to aldehyde at first, and to primary alcohol afterward.
10. All of the following are aromatic EXCEPT
⑴ answer: D
11. In a DNA double-helix, guanine and cytosine bases, shown below, are paired together by
⑴ answer: B
12. Of the following isomers, which is the most thermodynamically stable?
⑴ answer: B
⑵ If its substituent is equatorial, the molecule is stable.
13. Under constant current electrolysis, how many coulombs would be required to reduce 2 mol of Cu2+ to metallic copper? (ℱ = 96,500 coulombs/mol)
⑴ answer: E
⑵ 96,500 coulombs/mol × 2 mol Cu2+ × 2 mol e- / mol Cu2+ = 386,000 coulombs
14. For the reaction A + B → C + D carried out at constant temperature, the initial rates of reaction given below were found experimentally. The rate law of this reaction, expressed as a function of reactant concentrations, is
⑴ answer: D
⑵ When comparing the first and the second rows of the table, we could know the order of [A] is 1.
⑶ When comparing the second and the third rows of the table, we could know the order of [B] is 2.
15. Which of the following must be true about a binary liquid mixture that obeys Raoult's law?
Ⅰ. The partial pressure of each component at equilibrium is proportional to its mole fraction in the liquid mixture.
Ⅱ. The volume of the mixture is equal to the sum of the volumes of each component before mixing.
Ⅲ. Intermolecular interactions in the mixture are identical to intermolecular interactions in the pure components.
⑴ answer: E
16. In the reaction shown below, Cl- (aq) behaves as
⑴ answer: E
⑵ oxidation number of Cl- (reduced) : -1
⑶ oxidation number of HClO2 (oxidized) : +3
17. Elements with partially filled 4f or 5f orbitals include all of the following EXCEPT
⑴ answer: A
⑵ Cu: [Ar] 3d10 4s1
⑶ Gd: [Xe] 4f7 5d1 6s2
⑷ Eu: [Xe] 4f7 6s2
⑸ Am: [Rn] 5f7 7s2
⑹ Cm: [Rn] 5f7 6d1 7s2
18. Which of the following gives the multiplicities of the signals for the protons designated HA and HB in the 1H NMR spectrum of the compound shown below?
⑴ answer: E
⑵ The number of the neighboring hydrogens to HA is 3. → quartet
⑶ The number of the neighboring hydrogens to HB is 0. → singlet
19. In the compound shown below, which hydrogen is most easily abstracted in a free radical bromination reaction?
⑴ answer: D
⑵ The stability comparison of radicals is as follow: phenyl radical < vinyl radical < methyl radical < primary radical < secondary radical < tertiary radical ≪ allyl radical < benzyl radical.
20. Which of the following is the major product of the reaction shown below?
⑴ answer: C
⑵ acid-base reaction of alkyne
입력: 2022.03.01 12:07
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