Analyzing Matter Statements: Elements, Compounds, and Mixtures

The question asks to identify the incorrect statements about matter among the three given options.

Statement Analysis:

• Statement 1: Elements cannot be broken down into simpler substances.
  This statement is correct. By definition, an element is a pure substance consisting only of atoms that all have the same number of protons in their atomic nuclei. It cannot be broken down into simpler substances by chemical means.
• Statement 2: A compound has variable composition and can be broken down into elements.
  This statement is incorrect. A compound is formed when two or more elements are chemically bonded together. While a compound can be broken down into its constituent elements (e.g., by electrolysis), its composition is always fixed (constant proportions by mass), not variable. For example, water (H₂O) always consists of hydrogen and oxygen in a fixed ratio.
• Statement 3: The solution of sulphur in carbon disulphide is an example of a homogeneous mixture.
  This statement is correct. A solution is a type of homogeneous mixture where one substance dissolves completely into another, forming a uniform composition throughout. Sulphur dissolving in carbon disulphide forms such a solution.

Identifying Incorrect Statements

Based on the analysis:

• Statement 1 is correct.
• Statement 2 is incorrect due to the mention of "variable composition".
• Statement 3 is correct.

Therefore, only statement 2 is not correct.

Conclusion

The question asks which statement(s) are not correct. Only Statement 2 fits this criterion.

Final Answer: The final answer is 2 only