Question
Which one of the following is a compound?
Solution
- Glass
- Glass is a non-crystalline mixture of silica and other materials. It is not a compound because its composition is not fixed.
- Water Gas
- Water gas is a mixture of carbon monoxide (CO) and hydrogen (H ₂ ), not a compound. It is used as a fuel but doesn't have a fixed chemical formula as a single compound.
- CNG (Compressed Natural Gas)
- CNG is also a mixture, primarily of methane (CH ₄ ) with small amounts of other gases. It is not a compound.
- Plaster of Paris (POP)
- Plaster of Paris is CaSO4 ⋅ 1/2H2O, a true chemical compound with a definite composition.
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