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Worksheetschemical effects of electric current
Total questions: 20
Worksheet time: 10mins
To electroplate silver on Copper jewellery, the electrolyte that can be used is:
Copper Sulphate
Silver Nitrate
Ammonium Chloride
Sodium Chloride
When acidified water is electrolysed using carbon electrodes. What is produced at (+) and (-) electrodes.
(+) - Oxygen; (-) - Hydrogen
(+) - Oxygen; (-) - Carbon
(+) - Hydrogen (-) - Oxygen
Which of the following solutions will not make the bulb in Fig 14.2 glow?
(a)
(b)
(c)
(d)
sodium chlorides
copper sulphate
silver nitrate
sugar solution in diluted water
During electrolysis of water,
hydrogen gas is produced
oxygen gas is produced
water is produced
both (a) and (b)
The article to be electroplated is made
the anode
the cathode
either anode or cathode
none of these
While trying to put out fire in an electrical appliance, we should
pour distilled water on it
pour rain water on it
pour tap water on it
none of these
Tin cans used for storing food are made by electroplating
copper on iron
iron on tin
tin on zinc
tin on iron
Alloys of metals
allow electric current to flow through them
do not allow electric current to flow through them
sometimes allow and sometimes do not allow electric current to flow through them
None of these
The glowing of filament bulb is due to
Chemical effect of current
magnetic effect of current
Physical effect of electric current
Heating effect of electric current
one of the following is not used for electroplating metal articles. the one is -
nickel
chromium
sodium
silver
conductors can allow electricity because of the presence of
free ions
free electrons
free protons
atoms
Small amount of a mineral salt present naturally in water makes it a______________ of electricity.
insulator
conductor
both a and b
none of these
The object to be electroplated is taken as ____________ electrode.
cathode
anode
electrode
none of these
Which one of the following solutions will not conduct electricity?
lemon juice
vinegar
tap water
vegetable oil
Flow of electrons is called
Electrode
Electrolyte
Electric current
Electroplating
An electrolyte is
a metal
a solution
a liquid that conducts electricity
none of these
Adding common salt to distilled water makes it
Good Conductor
Poor Conductor
No change
Both A and B
LED stands for
light emitting diode
light efficient diode
length emitting diode
light emitting device
Which of the following metals is used in electroplating to make objects appear shining?
Iron
Copper
Chromium
Aluminium
