Question:
The gaseous mixture used for welding of metals is
The gaseous mixture used for welding of metals is
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Oxy-acetylene flame is widely used in welding because acetylene burns in oxygen to produce a very high temperature flame suitable for melting metals.
Updated On: Jun 22, 2026
- \(C_2H_4,\ O_2\)
- \(C_4H_{10},\ O_2\)
- \(C_2H_2,\ N_2\)
- \(C_2H_2,\ O_2\)
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The Correct Option is D
Solution and Explanation
Step 1: Identify the gas used in metal welding.
In metal welding, especially oxy-acetylene welding, the fuel gas used is acetylene: \[ C_2H_2 \] Acetylene burns in oxygen to produce a very high temperature flame.
Step 2: Write the combustion reaction.
The combustion of acetylene in oxygen is: \[ 2C_2H_2+5O_2\rightarrow4CO_2+2H_2O \] This reaction releases a large amount of heat and produces a flame temperature of about \[ 3000^\circ\text{C} \] which is sufficient for welding metals.
Step 3: Analyze the options.
(1) \(C_2H_4,\ O_2\): Ethylene is not commonly used for welding.
(2) \(C_4H_{10},\ O_2\): Butane is mainly used as fuel, not for welding.
(3) \(C_2H_2,\ N_2\): Nitrogen does not support combustion.
(4) \(C_2H_2,\ O_2\): Correct, this is the oxy-acetylene mixture used in welding.
Step 4: Final conclusion.
Hence, the gaseous mixture used for welding of metals is \[ \boxed{C_2H_2,\ O_2} \]
In metal welding, especially oxy-acetylene welding, the fuel gas used is acetylene: \[ C_2H_2 \] Acetylene burns in oxygen to produce a very high temperature flame.
Step 2: Write the combustion reaction.
The combustion of acetylene in oxygen is: \[ 2C_2H_2+5O_2\rightarrow4CO_2+2H_2O \] This reaction releases a large amount of heat and produces a flame temperature of about \[ 3000^\circ\text{C} \] which is sufficient for welding metals.
Step 3: Analyze the options.
(1) \(C_2H_4,\ O_2\): Ethylene is not commonly used for welding.
(2) \(C_4H_{10},\ O_2\): Butane is mainly used as fuel, not for welding.
(3) \(C_2H_2,\ N_2\): Nitrogen does not support combustion.
(4) \(C_2H_2,\ O_2\): Correct, this is the oxy-acetylene mixture used in welding.
Step 4: Final conclusion.
Hence, the gaseous mixture used for welding of metals is \[ \boxed{C_2H_2,\ O_2} \]
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