Prabin Kalikote

The fertilizer which supply all the basic nutrients, i.e nitrogen, phosphorus and potassium are
called NPK fertilizers.
It is called a complete fertilizer because they are made by mixing too or more than two single fertilizers which has sufficient amount of all required nutrients for the growth and development of plants.

Compost manure is an organic fertilizer which is made from dead, decayed and decomposed parts of animals and plants or other waste products.
It is prepared by mixture of dead plants, animals or their waste products are kept in a pit with altering layers of soil. Due to microbial action, the mixture gets decomposed into compost manure.

DDT : Dichloro diphenyol trichloro ethane

BHC: Benzene hexacloride

PVC: Poly vinyl chloride

RCC: Reinforced Cement Concrete

The artificial poisonous chemicals compounds that are used to kill or control harmful insect are called insecticides.
The effects that are seen due to excessive use of pesticides are:
    - Eco-balance is being disturbed.
    - Friendly insects are also dying along with rival insects.
    - Air pollution.
    - Health problems and mutation.
    - Environment degradation.

Detergents are one of the cheap and popular cleansing agents made from hydrocarbons of petroleum by-products.
Detergents are called soapless soup because it has cleansing property like that of soap but doesn't contains any chemicals that are found in soap. 

The process by which soap is prepared is called saporification. During saporification, sodium chloride is added in solution to increase the ironic products and decrease the solubility of the products. Soap having less density floats on the surface of the solution which are collected and kept into moulds to get soap cake. After, sodium carbonate is added to make the soap hard.

Sodium chloride increases the ionic product and decreases  the solubility products and sodium carbonate make the soap hard. So, they are used in soap.