Concept:Copper compounds with antifungal properties are used in agriculture to protect crops from fungal diseases.
Explanation:Copper(II) sulfate,
CuSO4, is the copper compound widely used as a fungicide.
It is commonly called blue vitriol.
It is often mixed with lime to form Bordeaux mixture, a well-known agricultural fungicide.
Bordeaux mixture is sprayed on crops to prevent fungal attacks.
It protects plants such as potatoes, tomatoes, and grapes from blight and mildew.
The other copper compounds listed have different major uses.
CuCO3 is mainly used as a green pigment in paints and ceramics.
Cu(NO3)2 is used in electroplating, dyeing, and as a catalyst.
CuCl2 is used as a mordant in dyeing and as a catalyst in organic reactions.
Therefore, among the options, the copper compound used as a fungicide is copper(II) sulfate.
Answer:C.
CuSO4