Question
Which of the following is a chemical
change?Solution
Rusting of iron is a chemical change because it forms a new substance (iron oxide) through a chemical reaction with oxygen and moisture. Heating and magnetization are physical changes as they don't alter the composition.
Wood spirit is
Which one of the following is known as the brown coal?
The function of skimming tank in sewage treatment is to removeÂ
Ozone layer is present in
Of the following which one pollutes the air of abig city?Â
Which one of the following is an example of a gel?
Brass is made of
The mass number of a nucleus is
The total energy of revolving electron in an atomÂ
The element used for making solar cells is