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沒有 【段考】國二英文上學期 權限，請先開通．

沒有 【段考】國二英文上學期 權限，請先開通．

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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

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.

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.

4. Which of the following contains the metal with the lowest oxidation number? (A) CaCl2 (B) FeSO4 (C) MnO2 (D) CrO3 (E) NaBr

5. Which detector is used in the infrared spectrum? (A) phototube (B) photomultiplier tube (C) photodiode arrays (D) silicon photodiodes (E) thermal detector