Question
……is not a compound?
Answer (Detailed Solution Below)
The correct answer is Lead
Lead is not a compound because it is a pure element, made up of only lead atoms.
Lead is a chemical element with symbol Pb. It is a heavy, soft, malleable metal with a low melting point.
A compound is formed when two or more elements are combined.
- Chalk: Chalk is a soft, white, porous sedimentary rock made up of the mineral Calcite, which is also known as calcium carbonate(CaCO3). It is a compound of made up of elements calcium, carbon and oxygen.
- Hydrogen sulphide: Hydrogen sulphide is a compound with a formula H2S. It is a colourless, flammable, and toxic gas with a foul odour of rotten eggs. It is corrosive and can damage organs if inhaled or ingested in large amounts.
- Sulphur dioxide: sulphur dioxide is a compound with the formula SO2. It is a colourless gas with a pungent smell similar to the odour of burnt matches. It is released by volcanic activity and also produced by the burning of sulphur bearing fossil fuel and as a by-product of copper extraction. It is toxic to humans if inhaled in large amounts.
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