Question

For cutting or welding of metals, oxygen gas is combined with

• A. methane
• B. acetylene
• C. butane
• D. alcohol

Answer 1

The correct option is B

acetylene

Explanation of correct option-

(B) Acetylene (C₂H₂)

• The mixture of oxygen and acetylene gas produces a special oxy-acetylene flame that produces a temperature of around 3300°C.
• The flame is hot enough to melt most of the metals and makes the process of welding and cutting easier.

Explanation of incorrect options-

(A) Methane (CH₄) - It is found in natural gas and is highly inflammable and does not produce such high temperatures required for welding.

(C) Butane (C₄H₁₀) - It is also a part of natural gas and the mixture does not produce high temperature.

(D) Alcohol (R-OH) - It is a liquid and generally does not burn in the air unless heated and is difficult to handle.

So, for cutting or welding of metals, oxygen gas is combined with acetylene gas.

Hence, option (B) is correct.