Chemical effects of electric current

which of the following is/are conductor(s)?

• Metals

• Electrolytes

• Rainwater

• All of them

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

Choose insulator from the following:

• Distilled water

• Plastic

• Wood

• All of them

Tin cans used for storing food are made by electroplating

• copper on iron

• iron on tin

• tin on zinc

• tin on iron

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

Iron is coated with (a)   to protect it from corrosion.

The article to be electroplated is made

• the anode

• the cathode

• either anode or cathode

• none of these

An (a)   is an atom or molecule with an electric charge created by loss or gain of electrons.

The filament of the bulb gets heated to a high temperature due to the

• magnetic effect of current

• heating effect of current

• chemical effect of current

• all of these

During electrolysis of water,

• hydrogen gas is produced

• oxygen gas is produced

• water is produced

• both (a) and (b)