Q.The branch of chemistry which deals with study of separation, identification, and quantitative determination of the composition of different substances is called as ............. a. Physical chemistry b. Inorganic chemistry c. Organic chemistry d. Analytical chemistry

Analytical chemistry is the branch of chemistry devoted to separating, identifying, and quantitatively or qualitatively determining the composition of substances, using suitable instruments and methods. Qualitative analysis tells you WHAT is present in a sample (detecting the presence or absence of particular elements or compounds), while quantitative analysis tells you HOW MUCH of each constituent is present — together they build a complete picture of a sample's chemical make-up. The subject matters well beyond the laboratory: chemical analysis is used to monitor the composition of raw materials, intermediates and finished products in industry, to check air quality around industrial premises, to determine the composition of soils and fertilizers in agriculture, to verify the composition of medicinal preparations in medicine, and to support evidence in forensic science and engineering. Because so many practical decisions depend on an analytical result, the reliability of analytical chemistry's methods — both the classical wet-chemical techniques and modern instrumental ones — is what gives the whole subject its value.