Question

Which of the following is used for the production of oxy-acetylene flame for welding and cutting metals
A.Ethane
B.Ethene
C.Ethyne
D.None of the above

Answer 1

To answer this question, you should recall the concept of working of oxy-acetylene flame. The oxy-acetylene flame refers to a gas torch that burns a mixture of acetylene and oxygen to produce a high-temperature flame.

Complete Step by step solution:
When ethyne gas is subjected to combustion in the presence of oxygen, the flame created is known to have a temperature of roughly $3600{\text{ K}}$. The energy released for every gram of fuel subjected to combustion has been calculated to be ${\text{11}}{\text{.8 kilojoules per gram}}$.
There are different types of oxy-acetylene flames: Neutral flame (mixture has equal amounts of oxygen and acetylene), Oxidising Flame(mixture contains more oxygen than acetylene) and carburising Flame ( mixture contains more Acetylene than Oxygen)
Therefore, ethyne, i.e. acetylene is used for the production of oxy-acetylene flame for welding and cutting metals.

Hence, we can conclude that the correct answer to this question is option C.

Note: You should know about the preparation of ethyne. It is prepared in industries by partial combustion of methane. Another method of preparation is the hydrolysis reaction of calcium carbide$(Ca{C_2})$ which is also known as calcium acetylide. The chemical equation for this hydrolysis reaction can be represented as:
${H_2}O{\text{ }} + {\text{ }}Ca{C_2}\; \to {\text{ }}{C_2}{H_2}\; + {\text{ }}Ca{\left( {OH} \right)_2}$.
Ethyne is also used in the production of various types of plastics like polyethene. Polyethene is a commonly used non-biodegradable polymer. It exists in different types: Linear high-density polyethene (HDPE), Branched low-density polyethene (LDPE) and Ultra-high molecular weight polyethene (UHMWPE).