Differentiate between oxy-hydrogen flame and oxy-acetylene flame?

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Solution

Oxy-hydrogen flame Oxy-acetylene flame
1. A mixture of oxygen and hydrogen gases 1. A mixture of oxygen and acetylene gases
2. The first gaseous mixture used for welding and cutting 2. Discovered later to be used for welding and cutting
3. The temperature of the oxy-hydrogen flame is about $2800 ° C$ 3. The temperature of the oxyacetylene flame is about $3000 ° C$
4. It is seldom used today 4. It is often used today
5. In oxy-hydrogen flame, hydrogen is burnt in a stream of oxygen. 5. The oxy-acetylene flame consists of oxygen. Acetylene is composed of carbon and hydrogen $(C_{2} H_{2})$ , and the gas burns in the air with a smoky flame.

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Give reasons :

(a) Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.

(b) A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.

(d) Apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame.

How does the atomic hydrogen or oxy-hydrogen torch function for cutting and welding purposes? Explain.

Burning acetylene with oxygen produces a very hot flame called oxy-acetylene flame.

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Oxy-hydrogen flame	Oxy-acetylene flame
1. A mixture of oxygen and hydrogen gases	1. A mixture of oxygen and acetylene gases
2. The first gaseous mixture used for welding and cutting	2. Discovered later to be used for welding and cutting
3. The temperature of the oxy-hydrogen flame is about $2800 ° C$	3. The temperature of the oxyacetylene flame is about $3000 ° C$
4. It is seldom used today	4. It is often used today
5. In oxy-hydrogen flame, hydrogen is burnt in a stream of oxygen.	5. The oxy-acetylene flame consists of oxygen. Acetylene is composed of carbon and hydrogen $(C_{2} H_{2})$ , and the gas burns in the air with a smoky flame.