Question

Match List I with List II :

Column I Ingredients Found in Rubber Closures		Column II  Example
A	Activator	I	Zinc dibutyldithiocarbamate
B	Curing agent	II	Stearic acid
C	Accelerator	III	Carbon black
D	Fillers	IV	Neoprene
		V	Peroxides

Choose the correct answer from the options given below :

• A. (A)-(II), (B)-(V), (C)-(I). (D)-(III)
• B. (A)-(V), (B)-(IV), (C)-(II), (D)-(I)
• C. (A)-(IV). (B)-(II), (C)-(III), (D)-(V)
• D. (A)-(III). (B)-(IV). (C)-(II), (D)-(I)

Answer 1

The Correct Option is A

Let's match the ingredients in rubber closures from Column I with their respective examples in Column II by understanding the roles these ingredients play in the rubber formulation process: 

1. Activator: Activators are chemicals used to increase the activity of accelerators, thus speeding up the curing process. In this case, Stearic acid is commonly used as an activator in the vulcanization process.
2. Curing agent: These are substances that help in the vulcanization of rubber. Peroxides are widely used as curing agents for cross-linking natural and synthetic polymers.
3. Accelerator: Accelerators help in hastening the vulcanization process. Zinc dibutyldithiocarbamate (ZDBC) is a common accelerator that speeds up the rubber curing process.
4. Fillers: Fillers reinforce and sometimes augment the properties of rubber. Carbon black is a widely used filler that enhances properties such as tensile strength and abrasion resistance.

By matching the descriptions and examples, we get:

Column I	Column II
A. Activator	II. Stearic acid
B. Curing agent	V. Peroxides
C. Accelerator	I. Zinc dibutyldithiocarbamate
D. Fillers	III. Carbon black

Therefore, the correct matching is (A)-(II), (B)-(V), (C)-(I), (D)-(III). This option explains the alignment of ingredients with their examples correctly.