CLASS VIII CHEMICAL EFFECTS OF ELECTRIC CURRENT

Which of the following statements is incorrect about the conductivity of water?

• Rain water is a good conductor of electricity.
• On addition of table salt, water conducts electricity.
• On addition of lemon juice, water conducts electricity.
• Water becomes a good conductor of electricity when heated.

Electroplating is based on ___________of an electric current.

• Physical effect

• Chemical effect

• Heating effect

• Magnetic effect

Out of the following, which metal is used to electroplate iron to make it shining and rust resistant?

• Gold

• Chromium

• Zinc

• Tin

Which of the following metals is used in electroplating to make objects appear shining?

• iron

• aluminium

• copper

• chromium

Flow of electrons is called

• Electrode

• Electrolyte

• Electric current

• Electroplating

Tick the chemical effect of elecric current

• boiling

• motion

• electro shock

• Electroplating

Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory

• in the nearby river.

• in the nearby pond.

• in the nearby cornfield.

• according to the disposal guidelines of the local authority.

Adding common salt to distilled water makes it

• Good Conductor

• Poor Conductor

• No change

• Both A and B

Which one of the following solutions will not conduct electricity?

• lemon juice

• vinegar

• tap water

• vegetable oil

An electrolyte is

• a metal

• a solution

• a liquid that conducts electricity

• none of these