How does the surface of iron that is exposed to air for a long time look like?

Explain why-(a) A green layeris formed on the surface of copper which is left exposed in moist air for a long period. (b) blue colour of the copper sulphate solution is discharged slowly when an iron rod is dipped in it. (c) Galvanised irono is not used as a fondstuff container.

What does a cell look like?

What happen when caustic soda beads are exposed to air for a long time.

What happns when washing soda is kept in air for long time?

How does the rate of a reaction depends on surface area of the reactant?

How black peeper looks like?

How the fruit of Sundri Plant look like?

How long does the winter stay?

Why does a spherical conductor retain its charge for a long time in comparison with the conductors of any other shape?