1992 年
化學 · 共 41 題 · 點擊選項即時核對答案
Using 1 mole of reactant, which of the following chemical changes involves the highest number of electrons ?
When 2 moles of oxygen gas are collected at the anode during the electrolysis of dilute sulphuric acid, the number of moles of electrons released at the anode is
Which of the following substances react with hot concentrated sulphuric acid ?
When sulphur dioxide is bubbled into sodium hydroxide solution for a long time, the final product is
Directions: Q.17 and Q.18 refer to the following experiment: A student measured the conductivity of a certain acid. When he added barium hydroxide solution dropwise to the acid, he found that the conductivity of the acid gradually dropped to almost zero.
The acid is probably
Directions: Q.17 and Q.18 refer to the following experiment: A student measured the conductivity of a certain acid. When he added barium hydroxide solution dropwise to the acid, he found that the conductivity of the acid gradually dropped to almost zero.
Which of the following reasons accounts for the change in the conductivity of the acid?
Solution X is 45 cm³ of 1.2 M HCl and Solution Y is 60 cm³ of 0.9 M CH₃COOH. Which of the following statement concerning X and Y is correct?
Which of the following compounds does NOT react with propan-1-ol ?
When 2-methylpropene reacts with bromine in tetrachloromethane, the product is
Direction Q.22 and Q.23 refer to the making of soap as represented by the following reaction:
Soap has a hydrophilic head and hydrophobic tail. Which of the following combination is correct ?
| Hydrophilic head | Hydrophobic tail | |
|---|---|---|
| Na⁺ | CH₃(CH₂)₁₆– | |
| –COO⁻ | CH₃(CH₂)₁₆– | |
| Na⁺ | CH₃(CH₂)₁₆COO⁻ | |
| CH₃(CH₂)₁₆COO⁻ | Na⁺ |