The compound of Copper used as a fungicide is

Analysis

The question asks for a specific copper compound that is widely utilized in agriculture as a fungicide. To solve this, we need to look at the chemical properties of copper salts and their common industrial or agricultural applications.

Concept Explanation

In agricultural chemistry, certain copper compounds are used to control fungal diseases in crops. The most common substance used for this purpose is Bordeaux mixture, which is a combination of copper(II) sulfate ($CuSO_4$) and slaked lime ($Ca(OH)_2$).

• Copper(II) sulfate ($CuSO_4$): This is the active ingredient in many fungicides and algaecides. It works by disrupting the enzymes in fungal cells, effectively killing the fungus or preventing its growth.
• Other options: • $CuCO_3$ (Copper carbonate) is primarily used as a pigment or in the production of other copper salts. • $Cu(NO_3)_2$ (Copper nitrate) is often used in electroplating and as an oxidizing agent. • $CuCl_2$ (Copper chloride) is used as a catalyst in organic synthesis and in the textile industry.

Step-by-Step Solution

1. Identify the chemical role: We are looking for a compound known for its fungicidal properties.
2. Evaluate the options: • $CuSO_4$ is historically and scientifically recognized as the primary copper compound used in agriculture to treat fungal infections on plants (often applied as Bordeaux mixture).
3. Conclusion: Among the choices provided, Copper(II) sulfate is the standard compound used for this specific agricultural application.

Answer

The correct option is C.

Exam Tip

When you see questions about the uses of copper compounds in JAMB, remember the "Big Three":

1. $CuSO_4$: Fungicide and testing for the presence of water (it turns from white to blue when hydrated).
2. $CuCl_2$: Catalyst in organic reactions.
3. $Cu(NO_3)_2$: Used in electroplating.

Focusing on these specific industrial/agricultural uses will help you answer similar questions quickly!