Question

Sate one property of hydrogen due to which it is used in welding.

Answer 1

• Oxy-hydrogen is a mixture of hydrogen (H₂) and oxygen (O₂).
  gases.
• This mixture is also known as ‘Knall-gas’.
• It is obtained by either electrolysis or combustion.
• Since both gases are combustible, it increases combustion.
• Hydrogen gas readily burns in oxygen or air along with the formation of water.
• The flame produced is neutral and it increases the temperature.
• The flame has a temperature of around 2800 degrees Celsius.
• At this temperature, metal tends to melt very easily.
• Therefore, it is generally used for welding and melting metal.