with reference to the uses of hydrogen,give reason-
a mixture of hydrogen and oxygen on burning, find application in welding and cutting metals

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Solution

Dear student,

Hydrogen is a highly reactive fuel. Hydrogen molecules violently react with oxygen when the existing molecular bonds break and new bonds are formed between oxygen and hydrogen atoms. As the products of the reaction are at a lower energy level than the reactants, the result is an explosive release of energy and the production of water. But hydrogen does not react with oxygen at room temperature, a source of energy is needed to ignite the mixture.
This heat released due to this exothermic reaction is used in welding and cutting metals.

Regards

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Similar questions

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.

___ is mixed with air or oxygen to be used for welding for cutting metals.

(= 2500^{\circ} C)

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (g)

Δ H = - 230.9 kJ

200 g

H_{2}

O_{2}

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