Suggest a quantitative method for estimation of the gas which protects us from U.V. rays of the sun.

The planet which is farthest from the sun is :

Write two methods of protection from lighning.

Give two methods to protect iron from rusting.

In Duma's method, the gas which is collected in nitrometer is

Concrete has been most widely used as a building material. It is reinforced by rods which make it hard and stronger. However, it has been noticed that some old buildings are showing signs of weakness and cracks. As a student of chemistry how would yu analyse this shocking situation? is there any method to protect these buildings from further damage?

For separating husk from wheat grains, which method is used ?

Name the metal which is electroplated on iron to protect it from corrosion.