Question

The temperature of oxyacetylene flame is about ________________ and that of oxyhydrogen flame is approximately ______________?

Answer 1

The oxy-acetylene flame is a kind of gas torch that burns a combination of acetylene and oxygen to provide a high-temperature flame suitable for welding, cutting, and other metalworking applications.

Complete answer:
First of all, let's know about oxyacetylene flame and oxyhydrogen flame.
Oxyacetylene Flame
Oxy acetylene flame is a mixture of oxygen and acetylene which produces an extremely hot flame.
Uses: - Welding or cutting metals
Oxy-fuel welding (often referred to in the United States as oxyacetylene welding, oxy welding, or gas welding) and oxy-fuel cutting are techniques that weld or cut metals using fuel gases (or liquid fuels such as gasoline) and oxygen. In 1903, French engineers Edmond Fouche and Charles Picard invented oxygen-acetylene welding. Instead of air, pure oxygen is utilized to raise the temperature of the flame, allowing for localized melting of the workpiece material (e.g., steel) in a room setting.
Oxyhydrogen flame
Oxyhydrogen is a chemical compound composed of hydrogen $H_2$ and oxygen (${O_2}$). This gaseous mixture is used to treat refractory materials in torches and was the first gaseous mixture to be utilized for welding. In theory, a hydrogen: oxygen ratio of 2:1 is sufficient to achieve optimum efficiency; in reality, a ratio of 4:1 or 5:1 is required to prevent an oxidizing flame.
This mixture may also be referred to as Knallgas (Scandinavian and German Knallgas: "bang-gas"), although some authors define knallgas as a generic term for the mixture of fuel and the precise amount of oxygen required for complete combustion; for example, 2:1 oxyhydrogen would be referred to as "hydrogen-knallgas."
Oxyacetylene flames reach temperatures of about 3000 $^0C$, whereas oxyhydrogen flames reach temperatures of approximately 2800 $^0C$.
The oxyacetylene method produces a high-temperature flame above 3000 $^0C$ by combusting pure oxygen and acetylene.
The oxy-hydrogen flame, which combines oxygen and hydrogen, may reach a temperature of 2800 $^0C$ by. This tool is used to cut and weld metals.

Note:
Oxyacetylene welding, often known as gas welding, is a welding procedure that uses the combustion of oxygen and acetylene. When combined in the proper proportions in a hand-held torch or blowpipe, a relatively hot flame with a temperature of around 3,200 $^0C$ is created.