Question

. (b) What is Thermit reaction ? Give their uses. (c) Pow is the most reactive metal extracted ? ​

Answer 1

Explanation:

A thermite reaction is basically iron oxide (rust) reacting with aluminum to produce molten iron. The products are aluminium oxide, elemental iron, and a large amount of heat. The reactants are commonly or thermite mixture is aluminum powder and iron oxide (rust) powder. When the mixture is heated, it starts reacting as the aluminum is more reactive than the iron and aluminium forms stronger and stable bonds with oxygen than iron.

Uses-

1.The reaction is used for thermite welding, often used to join rail tracks. 2.Thermites have extremely high temperature and also been used in metal refining, demolition of ammunitions, and in incendiary weapons.

3.Some thermite-like mixtures are used in fireworks.

4.A thermite reaction is used to purify the ores of some metals called as thermite process.

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Answer 2

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What is Thermit reaction ?

answer-Thermite is a pyrotechnic composition of metal powder and metal oxide. When ignited by heat or chemical reaction, thermite undergoes an exothermic reduction-oxidation reaction. Most varieties are not explosive, but can create brief bursts of heat and high temperature in a small area.

C)Pow is the most reactive metal extracted ?

answer-Metals such as sodium, magnesium, calcium, aluminium high up in the reactivity series are very reactive and cannot be obtained from their compounds by heating with carbon. This is because these metals have more affinity for oxygen than carbon. These metals are obtained by electrolytic reduction.

For Na, K, Ca, Mg, Al, all these metals cannot be reduced by coke or carbon monoxide. Electrolytic method is the only way to reduce these metals.

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