2010 年

The structure of a sulphur molecule in sulphur powder is shown below :

Which of the following statements is correct ? (Relative atomic mass : S = 32.1)

Which of the following processes gives hydrogen gas as the major product ?

A certain oxide of manganese contains 49.5% of manganese by mass. What is the empirical formula of this oxide ? (Relative atomic masses : O = 16.0, Mn = 54.9)

In an experiment to study the electrolysis of copper(II) sulphate solution, the set-up used is shown below :

Which of the following statements concerning the above experiment is correct ?

Solid acid T has a relative molecular mass of 192.0. A sample of 0.80 g of T is dissolved in water to form a solution which requires 25.0 cm³ of 0.50 M sodium hydroxide solution for complete neutralisation. What is the basicity of T ?

Consider the experimental set-ups shown in the figures below :

In Figure 1, if the Cu is replaced by Y, which of the following statements is correct ?

What is the theoretical volume of carbon dioxide gas, measured at room temperature and pressure, that can be obtained by adding 100 cm³ of 2.0 M HCl(aq) to 0.80 g of Na₂CO₃(s) ? (Relative atomic masses : H = 1.0, C = 12.0, O = 16.0, Na = 23.0, Cl = 35.5; molar volume of gas at room temperature and pressure = 24 dm³)

Compound E rapidly decolourises cold acidified potassium permanganate solution. When E is added to sodium hydrogencarbonate solution, effervescence occurs. Which of the following compounds may E be ?

20.0 cm³ of 1.0 M NaCl(aq) is mixed with 10.0 cm³ of 2.0 M Na₂CO₃(aq). What is the concentration of Na⁺(aq) ions in the resulting solution ?

Which of the following steps should be involved in an experiment to prepare copper(II) sulphate crystals ?