1993 年
化學 · 共 29 題 · 點擊選項即時核對答案
In which of the following equations does the underlined substance undergo reduction ?
With reference to the above diagram, which of the following statements is correct ?
In the above experiment, which of the following major products will be liberated at the electrode ?
| cathode | anode | |
|---|---|---|
| magnesium | oxygen | |
| magnesium | bromine | |
| hydrogen | bromine | |
| hydrogen | oxygen |
Direction: Q.20 and Q.21 refer to the following experiment: Three different pairs of metal wires are placed separately in petri dishes (as shown in the diagram below) containing a mixture of gelatin, potassium hexacyanoferrate(III) solution and phenolphthalein solution.
Which of the following statements are correct ?
Direction: Q.20 and Q.21 refer to the following experiment: Three different pairs of metal wires are placed separately in petri dishes (as shown in the diagram below) containing a mixture of gelatin, potassium hexacyanoferrate(III) solution and phenolphthalein solution.
In Dish II, which of the following colours will develop around the iron wire and the copper wire ?
| iron wire | copper wire | |
|---|---|---|
| pink | blue | |
| blue | pink | |
| pink | no colour | |
| blue | no colour |
Which of the following reactions would produce a halogen ?
Which of the following statements about a solution of hydrogen chloride in water is correct ?
There is a gradual change in the properties of halogens from chlorine to iodine. Which of the following properties are in the order
chlorine < bromine < iodine ?
Which of the following solutions forms a precipitate with excess aqueous ammonia?
C₁₀H₂₂ → C₆H₁₄ + 2X (catalyst, heat) In the above process, which of the following combinations is correct?
| Process | X | |
|---|---|---|
| fractional distillation | an alkane | |
| fractional distillation | an alkene | |
| cracking | an alkane | |
| cracking | an alkene |