JAMB - Chemistry (1992 - No. 29)
Which of the following combination of gases is used for metal welding? i. Oxygen and ethyne, ii. Hydrogen and ethyne, iii. Hydrogen and oxygen, iv. Ethyne, hydrogen and oxygen.
i and ii
ii and iv
i and iii
ii and iv
설명
Oxyhydrogen is a mixture of hydrogen and oxygen gases.
This gaseous mixture is used for torches to process refractory materials and was the first gaseous mixture used for welding.
A gas torch that burns a mixture of acetylene and oxygen to produce a high-temperature flame (3,000°C or 5,400°F) that can weld or cut metal.