1990 年
化學 · 共 34 題 · 點擊選項即時核對答案
Which of the following pairs of metals would be expected to give the largest voltage when they are used as electrodes in a simple chemical cell using potassium nitrate solution as the electrolyte ?
Bromine has a low melting point because
Dry zinc chloride solid is a non-conductor of electricity because
Gas X is bubbled steadily into solution Y as shown in the set-up below:
In which of the following cases will NO observable change occur in solution Y ?
| gas X | solution Y | |
|---|---|---|
| sulphur dioxide | bromine water | |
| sulphur dioxide | calcium hydroxide | |
| carbon dioxide | bromine water | |
| carbon dioxide | calcium hydroxide |
16.1 g of a hydrated metal sulphate was heated to constant mass. After cooling to room temperature, the residual anhydrous metal sulphate weighed 7.1 g. How many moles of water of crystallization are there in one mole of the hydrated metal sulphate ? (Relative molecular masses: anhydrous metal sulphate = 142.0, water = 18.0)
Which of the following hydroxide is insoluble in BOTH excess sodium hydroxide solution and excess aqueous ammonia?
Clothes stained with grease can be cleaned by detergents because detergents can
Which of the following combinations is correct ?
Which of the following statements concerning the production of soap from vegetable oils and sodium hydroxide solution is/are correct ?
A glass of sweet wine is left on a dinning table. After two days, the wine becomes sour. Which of the following type of reactions accounts for this change ?
Which of the following polymers is/are made by condensation polymerization ?
