Chemicals that are produced in small quantities and with very degree of purity are

Analyze the question: The question asks for the type of chemicals made in small quantities but with a very high degree of purity. (The question says "very degree of purity", which is almost certainly a typo for "very high degree of purity".)

Concept: classification of industrial chemicals

• Heavy chemicals: made in very large quantities (thousands of tonnes) and usually not very pure. Examples are sulphuric acid, sodium carbonate and sodium hydroxide.
• Bulk chemicals: also made in large quantities, such as fertilizers and industrial solvents. Purity is not the main concern.
• Fine chemicals: made in small quantities, with very high purity and a high price. Examples are pharmaceuticals, reagents for analysis, and some dyes, pigments and perfumes.
• Light chemicals: not a standard category for this classification. The term is not used for chemicals defined by quantity and purity.

Step-by-step solution:

1. The key features are "small quantities" and "high purity".
2. Heavy and bulk chemicals are produced in large amounts, so A and C are eliminated.
3. "Light chemicals" is not a recognized category for this definition, so D is eliminated.
4. That leaves fine chemicals, which match both features.

Answer: B. Fine chemicals

Exam tip: Remember "Fine = Few and Flawless". Fine chemicals are produced in small amounts and are very pure. "Heavy" and "bulk" both mean large tonnage.