GS PrelimsScience and TechnologyGeneral Science1998

Consider the following statements about acetylene: 1. It is used in welding industry. 2. It is raw material for preparing plastics. 3. It is easily obtained by mixing silicon carbide and water. Of these statements:

A

I and II are correct

B

I and III are correct

C

II and III are correct

D

I, II and III are correct

Correct Answer: Option A

Explanation

1. The question asks to evaluate three statements about acetylene (C₂H₂). 2. Statement 1: It is used in the welding industry. This is true. Oxy-acetylene welding uses the very high temperature flame produced by burning acetylene in oxygen. 3. Statement 2: It is a raw material for preparing plastics. This is true. Acetylene can be polymerized to form polyacetylene and is also used as a starting material for synthesizing other monomers (like vinyl chloride for PVC) used in plastic production. 4. Statement 3: It is easily obtained by mixing silicon carbide and water. This is false. Acetylene is commonly produced by the reaction of calcium carbide (CaC₂) with water, not silicon carbide (SiC). 5. Therefore, statements 1 and 2 are correct. 6. This corresponds to option (A).

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