1992 年
化學 · 共 41 題 · 點擊選項即時核對答案
Which of the following statements concerning CH₃CH₃, CH₃CH₂CH₃ and CH₃CH(CH₃)CH₃ is correct?
The polymer formed by H₂N–(CH₂)₆–NH₂ and
A. has a formula of
B. is a thermosetting plastic. C. has cross-linkages. D. burns with a floral smell.
Consider the following chemical equilibrium: Cr₂O₇²⁻(aq) + H₂O(l) ⇌ 2CrO₄²⁻(aq) + 2H⁺(aq) (orange) (yellow) Which of the following statements is correct?
The following experiment results were obtained when 2 M HCl was allowed to react separately with 2 M NaOH and 2 M KOH:
| Expt No. | Volume of acid | Volume of alkali | Rise in temperature |
|---|---|---|---|
| 1 | 100 cm³ of 2 M HCl | 100 cm³ of 2 M NaOH | T₁°C |
| 2 | 200 cm³ of 2 M HCl | 200 cm³ of 2 M KOH | T₂°C |
Which of the following is correct?
In the above graph, curve X was obtained by the reaction between 100 cm³ of 1 M HCl and excess zinc granules. Which of the following changes would produce curve Y?
After 50 cm³ of 0.60 M H₂SO₄ have completely neutralized 100 cm³ of 0.6 M NaOH, the concentration of the resulting sodium sulphate solution is
The atomic number and mass number of element E are 8 and 17 respectively. What are the number of protons and neutrons in an atom of E ?
| Number of protons | Number of neutrons | |
|---|---|---|
| 8 | 9 | |
| 8 | 17 | |
| 9 | 8 | |
| 9 | 17 |
In the above experiment, a gas is evolved and burns at the jet. Metal X is probably
Which of the following ions is/are coloured ?
Which of the following metals can be obtained by reducing their oxides with carbon ?