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- 1. Multiple Choice
Which substance does NOT produce a gas at both electrodes during electrolysis?
concentrated aqueous sodium chloride
concentrated hydrochloric acid
dilute sulfuric acid
molten lead(II) bromide
- 2. Multiple Choice
Using reactivity series of metals, which of the following metals is the least reactive ?
Potassium
Aluminium
Iron
Gold
- 3. Multiple Choice
Which metal could not be used for electroplating by using an aqueous solution?
sodium
copper
silver
gold
- 4. Multiple Choice
The diagram shows apparatus for plating a spoon with silver.
Which statement is not correct?
The spoon would be connected to the positive terminal of the power supply.
The spoon would be connected to the negative terminal of the power supply.
The metal electrode would be made from silver.
The electrolyte would be a silver salt (contains silver cations) dissolved in water.
- 5. Multiple Choice
A student wishes to electroplate an object with copper.
Which row is correct?
A
B
C
D
- 6. Multiple Choice
The diagram shows the electroplating of a steel object.
A student made the following statements.
1 The object turns a reddish-brown colour.
2 The copper sulfate solution changes to a paler blue colour.
3 The copper electrode becomes smaller.
Which statements are correct?
1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only
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