Advertisements
Advertisements
Question
What is a thermite reaction? Explain with the help of an equation. State one use of this reaction.
Solution
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.
APPEARS IN
RELATED QUESTIONS
State two important uses of following metals:
Uses of iron
State two important uses of following metal
Uses of mercury
Why are alkali metals kept in kerosene oil?
With reference to the following metals state their use in daily life metal:
Aluminium
With reference to the following metals state their use in daily life metal:
Zinc
Name the following:
The chemical compound responsible for the green deposit on the surface of articles of copper.
Higher Order Thinking Skills.
Aakash noticed that the metal latch on gate was difficult to open during hot sunny days. However, it was not difficult to open the same latch at night. Aakash observed that the latch and the gate are exposed to the sun during day time.
- Formulate a hypothesis based on the information provided.
- Briefly state how you would test the hypothesis.
The electronic configurations of three elements X, Y and Z are X – 2, 8; Y – 2, 8, 7 and Z – 2, 8, 2. Which of the following is correct?
Give an example of a metal which
- is liquid at room temperature.
- is the best conductor of heat.
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
Metal atoms tend to have a maximum of ______ electrons in the outermost shell.
