Question

Q. 2. There are different types of chemical reactions occurring around us or being carried out for
the benefit of mankind, e.g., combination reactions, decomposition reactions, displacement
reactions, precipitation reactions, neutralisation reaction, reduction-oxidation (redox)
reactions, photochemical reactions etc.
Now, answer the following questions :
(1) Combustion of coke is a combination reaction. CO2 is not a pollutant. Then why is combustion
of coke harmful ?
(1) Which decomposition reaction followed by two combination reactions are involved in white-
wash of walls ?
) What value has been added to our lives by electroplating? Give two examples.
0) How photochemical reactions have played an important role in photography ?​

Answer 1

Explanation:

During a chemical reaction, atoms do not disappear from the mixture and appear elsewhere. Nor do they change from one element to atoms of another element. In fact, during chemical reactions, bonds between atoms are broken and re-made to give rise to new substances. Let’s understand how this happens in different types of reactions.

Answer 2

Answer:

Which decomposition reaction followed by two combination reactions are involved in white-

wash of walls ?