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Q: ______ is not a compound?
  • A. Lead
  • B. Chalk
  • C. Hydrogen sulphide
  • D. Sulphur dioxide
Correct Answer: Option A - When two or more elements are joined together by chemical bonding in a certain proportion, the substance which is formed is called a chemical compound. Such as chalk, hydrogen sulphide, sulphur dioxide. Lead (Pb) is a pure element. It is not a compound.
A. When two or more elements are joined together by chemical bonding in a certain proportion, the substance which is formed is called a chemical compound. Such as chalk, hydrogen sulphide, sulphur dioxide. Lead (Pb) is a pure element. It is not a compound.

Explanations:

When two or more elements are joined together by chemical bonding in a certain proportion, the substance which is formed is called a chemical compound. Such as chalk, hydrogen sulphide, sulphur dioxide. Lead (Pb) is a pure element. It is not a compound.