Chemical effect of electric current Class - VIII

Which of the following is a bad conductor of electricity?

• Distilled water

• Silver nitrate

• Sulphuric acid

• Copper sulphate

An electric current can produce

• heating effect

• chemical effect

• magnetic effect

• all of these

Electroplating is based on

• heating effect of electricity

• chemical effect of electricity

• physical effect of electricity

• magnetic effect of electricity

An electrolyte is

• a metal

• a non-metal

• a liquid that conducts current

• none of these

An electric lamp glows due to

• heating effect

• magnetic effect

• chemical effect

• physical effect

Electroplating prevents

• corrosion

• passing of current

• dissociation

• shining

Which of the following is not used for electroplating metal articles?

• Nickel

• Silver

• Chromium

• Sodium

Iron objects can be protected by electroplating them with

• Chromium

• nickel

• zinc

• all of these

When electrodes are immersed in water and electricity passed, the bubbles formed on the positive terminal is actually _______ gas.

• Hydrogen

• carbon dioxide

• Oxygen

• Nitrogen

Why do we add little dilute sulphuric acid to copper sulphate solution during electroplating?

•  To increase acidity

• To increase conductivity

• So that the colour becomes more prominent

• To burn copper sulphate