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A mixture of oxygen and ethyne is burnt for welding. Which of the following statements is correct about NOT using a mixture of ethyne and air? 1. Ethyne may not burn completely with air as with pure oxygen. 2. Without mixing oxygen, it is difficult to reach the high temperatures needed for welding. Select the correct answer using the code given below.

A mixture of oxygen and ethyne is burnt for welding. Which of the following statements is correct about NOT using a mixture of ethyne and air? 1. Ethyne may not burn completely with air as with pure oxygen. 2. Without mixing oxygen, it is difficult to reach the high temperatures needed for welding. Select the correct answer using the code given below. Correct Answer Both 1 and 2

The correct answer is Both 1 and 2.

Important Points

  • When ethyne is burnt with air, it gives a yellow sooty flame which has much lower temperatures.
  • This is because ethyne is not burnt completely. So, statement 1 is correct.
  • When pure oxygen is used, the flame is cleaner, the combustion of ethyne is complete, and much higher temperatures can be used with lesser quantities of ethyne. So, statement 2 is correct.
  • Moreover, air contains many gases other than oxygen which may be undesirable in the process of welding.
  • This is why oxygen is used instead of air.

Related Questions

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