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प्रश्न
What is a thermite reaction? Explain with the help of an equation. State one use of this reaction.
उत्तर
A thermite reaction is a reaction in which a metal oxide is reduced by using aluminium as the reducing agent. It is generally exothermic in nature, wherein a large amount of heat is liberated. Due to this heat, the metals produced are in the molten state.
An example of thermite reaction is the reduction of iron (III) oxide by using aluminium powder
Iron metal is produced when a mixture of iron (III) oxide and aluminium powder is ignited with a magnesium ribbon. The iron, so obtained, is in the molten state due to the large amount of heat liberated in the process. This is used to weld broken pieces of iron.
The above reaction is widely used in thermite welding to join broken pieces of iron.
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संबंधित प्रश्न
Which of the following alloys contains mercury as one of the constituents?
(a) stainless steel
(b) solder
(c) duralumin
(d) zinc amalgam
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Iodine
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Uses of iron
Give the general characteristics of:
Alkali metals,
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Write name of any element present in the same group as X
What is it made from? Why?
A pair of tongs.
With reference to the following metals state their use in daily life metal:
Lead
The metal which is liquid at room temperature is ______.
In the given figure, you find that the bulb glows when an iron nail is placed between two ends of wire. Complete the following sentences on the basis of this fact.
- ______ is a metal.
- Metals are good ______ of electricity.
All gases are ______.
