The parts of electrical objects that need to let electricity pass through are always made of metal, whereas the plastic covering that surrounds wires is an electrical insulator. Give reason.

Name an allotrope of a non-metal that allows electricity to pass through it.

The electric current passes through a metallic wire produces heat because of :

When electricity is passed through acidified water, it decomposes to give hydrogen and carbon dioxide.

To which wire is the metallic case of an electric appliance connected ? Give the reason.

(a) List the factors on which the resistance of a conductor in the shape of the wire depend. (b) Why are metals good conductors of electricity whereas glass is a bad conductor of electricity ? Give reason . (c ) Why are alloys commonly used in eletrical heating devices ? Give reason.

For earthing an electric appliance, one has to remove the paint from the metallic body of the appliance where the electric contact is made. Explain the reason.

What happens when the radiations obtained from a radio active substance are passed through an electric field, marks are found at three places on the photographic plate placed in its path. Give reason.?

A metal is know to form fluoride MF_(2) . When 10A of electricity is passed through a molten sat for 330sec, 1.95g of metal is deposited. Find the atomic weight of M. what will be the quantity electricity required to deposit the same mass of Cu form CuSO_(4) ?

10800 C of electricity passed through the electrolyte deposited 2.977g of metal with atomic mass 106.4 g mol^(-1) . The charge on the metal cation is