UPSC Prelims 1998·GS1·science-and-technology·materials and robotics

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

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  1. AI and II are correctCorrect
  2. BI and III are correct
  3. CII and III are correct
  4. DI, II and III are correct

Explanation

The correct answer is A because of the following reasons: Statement I is correct because acetylene, when mixed with oxygen, creates an oxy-acetylene flame that reaches very high temperatures, making it ideal for cutting and welding metals. Statement II is correct because acetylene serves as a vital chemical building block in the synthesis of various polymers and plastics, such as PVC and neoprene rubber. Statement III is incorrect because acetylene is produced by the reaction of calcium carbide with water, not silicon carbide. Silicon carbide is an abrasive material and does not produce acetylene when mixed with water.
science-and-technology: Consider the following statements about acetylene: I. It is used in welding industry. II. It is raw material for prepari

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