When dilute sulphuric acid is poured on a copper plate, copper sulphate is formed. Let's understand the reaction in detail:

1. Introduction:
Dilute sulphuric acid is a solution of sulphuric acid in water. Copper is a metal that reacts with dilute sulphuric acid to form a compound called copper sulphate.

2. Chemical Reaction:
The reaction between dilute sulphuric acid and copper can be represented by the following chemical equation:
Cu + H2SO4 → CuSO4 + H2

3. Explanation:
- The copper plate (Cu) reacts with the dilute sulphuric acid (H2SO4) to form copper sulphate (CuSO4) and hydrogen gas (H2).
- During the reaction, the copper atoms lose electrons to form copper ions (Cu2+), which combine with sulphate ions (SO4 2-) from the sulphuric acid to form copper sulphate.
- At the same time, hydrogen gas is evolved as a byproduct of the reaction.

4. Formation of Copper Sulphate:
- Copper sulphate is a blue crystalline solid that dissolves in water to form a blue solution.
- The formation of copper sulphate is a chemical change, as new substances are formed during the reaction.
- The blue color of copper sulphate solution indicates the presence of copper ions.

5. Importance of Copper Sulphate:
- Copper sulphate is widely used in various industries and applications.
- It is used as a fungicide in agriculture to control fungal diseases on plants.
- It is also used in electroplating to coat objects with a layer of copper.
- Copper sulphate is used in laboratories for various chemical tests and experiments.

In conclusion, when dilute sulphuric acid is poured on a copper plate, copper sulphate is formed. This reaction is represented by the chemical equation Cu + H2SO4 → CuSO4 + H2. Copper sulphate is a useful compound with various applications in agriculture, industry, and laboratories.