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Electrochemistry
6 Class 9 Chemistry questions with answers and explanations.
Printable worksheet with answer key
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The process of splitting a compound by passing electric current through it is called:
- 1 Filtration
- 2 Combustion
- 3 Electrolysis
- 4 Distillation
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In electrolysis, the electrode connected to the negative terminal of the battery is the:
- 1 Salt bridge
- 2 Anode
- 3 Cathode
- 4 Electrolyte
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Correct answer: Cathode
The cathode is the negative electrode and attracts positive ions.
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Oxidation is the:
- 1 Loss of neutrons
- 2 Gain of electrons
- 3 Loss of electrons
- 4 Gain of protons
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Correct answer: Loss of electrons
Oxidation means loss of electrons (OIL RIG).
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What is collected at the cathode when molten sodium chloride is electrolysed?
- 1 Hydrogen
- 2 Sodium
- 3 Chlorine
- 4 Oxygen
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Correct answer: Sodium
Sodium ions gain electrons at the cathode to form sodium metal.
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Electroplating is used to:
- 1 Cool a metal
- 2 Make water pure
- 3 Make alloys
- 4 Coat one metal with a thin layer of another
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Correct answer: Coat one metal with a thin layer of another
In electroplating a metal is coated by electrolysis, for example chromium or silver plating.
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The oxidation number of oxygen in most compounds is:
- 1 -2
- 2 +1
- 3 +2
- 4 0