CLASS VIII CHEMICAL EFFECTS OF ELECTRIC CURRENT

Front

Electroplating is based on ___________ of an electric current.

Back

Chemical effect

Front

Electroplating prevents

Back

rusting

Front

What is plated on iron to prevent it from reacting with food? Options: Gold, Chromium, Tin, Zinc

Back

Tin

Front

Which metal is used to electroplate iron to make it shining and rust resistant? Options: Gold, Chromium, Zinc, Tin

Back

Chromium

Front

Is sugar solution a good conductor of electricity?

Back

False

Front

Does chromium corrode easily?

Back

False

Front

How should Boojho’s uncle dispose of the waste from his electroplating factory?

Back

According to the disposal guidelines of the local authority.

Front

Which one of the following solutions will not conduct electricity? lemon juice, vinegar, tap water, vegetable oil

Back

vegetable oil

Front

Which statement is incorrect about the conductivity of water? Options: 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.

Back

Water becomes a good conductor of electricity when heated.

Front

When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. Why do the bubbles rise from the solution?

Back

of the chemical effect of current