CLASS VIII CHEMICAL EFFECTS OF ELECTRIC CURRENT

Electroplating is based on ___________of an electric current.

• Physical effect

• Chemical effect

• Heating effect

• Magnetic effect

Electroplating prevents

• electric current

• chemical effect

• lightening

• rusting

Which of these is plated on the iron to prevent it from chemically reacting with food?

• Gold

• Chromium

• Tin

• Zinc

Tags

NGSS.HS-PS2-6

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

• Gold

• Chromium

• Zinc

• Tin

Sugar solution is a good conductor of electricity.

• True

• False

Chromium corrodes easily.

• True

• False

Tags

NGSS.HS-PS1-1

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 corn field

• according to the disposal guidelines of the local authority.

• in the nearby pond

Tags

NGSS.HS-ESS3-4

NGSS.HS-ESS3-6

NGSS.HS-LS2-7

Which one of the following solutions will not conduct electricity?

• lemon juice

• vinegar

• tap water

• vegetable oil

Tags

NGSS.MS-PS2-3

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.

When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution because

• of the heating effect of current
• of the chemical effect of current
• current produces magnetic field around the electrodes
• current always produces air bubbles when passed through a liquid