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107年 - 2018臺南市市立復興國中八年級107 上學期英文第一次段考(期中考)翰林#84262
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A(0), B(6), C(3), D(2), E(0) #2241173
詳解 (共 1 筆)
NEW TOEIC 915
B1 · 2021/02/22
#4556226
7. What happens when...
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1. Coco-Cola® is carbonated by injecting the liquid with carbon dioxide gas. Under what conditions is the solubility of carbon dioxide gas the greatest? (A) low temperature, low pressure (B) low temperature, high pressure (C) low temperature, pressure is not a factor (D) high pressure, temperature is not a factor (E) high temperature, high pressure
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2. Ninhydrin is the hydrate of a triketone and is in equilibrium with it.In the following statements which one is TRUE? (A) Ninhydrin is a good reagent for testing α-amino acids, usually carried out at acidic condition. (B) The positive ninhydrin test usually exhibits an intense purple color. (C) Ninhydrin is a good reagent for testing nucleosides, usually carried out at basic condition. (D) The positive ninhydrin test usually exhibits a red color. (E) The positive ninhydrin test usually exhibits a green color.
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3. Which one is WRONG for gas chromatography? (A) The mobile phase does not interact with molecules of the sample. (B) Capillary columns provide higher resolution than packed columns. (C) Reproducible retention times require control of the column temperature. (D) Immobilized liquid phase should be chemical inert and low volatile. (E) This method is applicable to species that are appreciably non-volatile.
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4. Which of the following contains the metal with the lowest oxidation number? (A) CaCl2 (B) FeSO4 (C) MnO2 (D) CrO3 (E) NaBr
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6. A fatty acid gives nonanal and 9-oxononanoic acid on ozonolysis followed by zinc treatment. This fatty acid gives stearic acid on hydrogenation by H2/Pd. What is this fatty acid? (A) Lauric acid (B) Palmitic acid (C) Arachidic acid (D) Oleic acid (E) Arachidonic acid
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7. Cell membranes are composed mostly of _____________ organized into a lipid bilayer which serves as an effective barrier to the passage of water, ions, and other components into and out of cells. (A) glycerophospholipids (B) sphingomyelins (C) prostaglandins (D) lipids (E) fatty acid
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8. Wohl degradation: a multi-step reaction sequence for degrading an aldose into the next lower homolog. What is the missing reagent in the following Wohl degradation? (A) KMnO4 (B) AgO (C) NH3 (D) NH2NH2 (E) NH2OH
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9. Lactose yields 1 equivalent D-glucose and 1 equivalent _________ on hydrolysis. (A) D-fructose (B) D-galactose (C) D-mannose (D) D-ribose (E) D-deoxyribose
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10. Sucrose is an example of__________. (A) a reducing sugar (B) a ketohexose (C) an anomer of ribose (D) an aldohexose (E) a disaccharide
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