The compound of which elements would NOT be used to make fertilisers?ANitrogenBPhosphorusCCarbonDSulfur

To determine which compound of elements would not be used to make fertilizers, we need to analyze the properties and roles of each element mentioned: nitrogen, phosphorus, carbon, and sulfur.

1. Nitrogen (N): Nitrogen is an essential element in fertilizers. It is a key component in amino acids, proteins, and chlorophyll, which are vital for plant growth and development. Nitrogen-based compounds like ammonia (NH3) and urea (CO(NH2)2) are commonly used in fertilizers.

2. Phosphorus (P): Phosphorus is another crucial element in fertilizers. It plays a significant role in energy transfer and storage, as well as in the formation of DNA, RNA, and ATP. Phosphorus-based compounds like phosphates (PO4) are commonly used in fertilizers.

3. Carbon (C): Carbon is an essential element for all living organisms, including plants. However, carbon-based compounds are not typically used directly as fertilizers. Carbon is mainly obtained by plants through photosynthesis, where they convert carbon dioxide (CO2) into organic compounds.

4. Sulfur (S): Sulfur is also an essential element for plant growth. It is involved in the synthesis of certain amino acids and vitamins. Sulfur-based compounds like sulfates (SO4) are sometimes used in fertilizers to provide sulfur to plants.

Based on this analysis, we can conclude that carbon (C) is the element that would not be used to make fertilizers. While carbon is essential for plant growth, it is obtained through photosynthesis and is not typically added directly as a compound in fertilizers.