Science Question Answer (1 Marks)

Copper and Gold are purified by using the chemical effect of current (or electrolysis).

Gold and silver are electroplated on cheaper metals for making jewelry or ornaments.

Copper sulphate is one chemical compound which is produced by using the chemical effect of electric current.

Electric current must be passed through water to decompose water into hydrogen and oxygen.

Water is one compound which is decomposed into hydrogen and oxygen by using the chemical effect of electric current.

The advantage of using LEDs is because, they glow up even if very small amount of current passes through them.

Tap water and lemon water conduct electricity, this happens because tap water. While distilled water and wine do not conduct electricity.

This is called chemical effect of heating and the process is called as electroplating.

When electric current is passed through acidified water, it dissociates water into H+ and OH- ions. This process is called chemical effect.

The conducting solution used in the electroplating process is the waste generated by electroplating factories.

A Light Emitting Diode (LED) glows even when a weak electric current passes through it.

Carbon and hydrogen are extracted by using the chemical effect of electric current.

Light emitting Diode (LED).

Liquids do conduct electricity, when they have free ions available like in case of Acids, Bases and Salts being dissolved in water.

Chromium is electroplated on car parts such as bumpers and bicycle handlebars made of steel.

Tin is electroplated on iron for making 'cans' used for storing food.

The current carrying wire behaves like a magnet and it will cause deflection of the needle of the compass. This is called magnetic effect of electric current.

Vinegar is a poor conductor of electricity because it does not have any free ions to carry electric charge and conduct electricity.

Because wet hands have water and water is a good conductor of electricity. A person can get electric shock if he touches any electrical appliances with wet hands.