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Its constituents are combined chemically.
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Its constituents do not retain their individual properties.
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It can be separated by physical methods into its constituents.
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Solution
The correct options are
A
It is a pure substance.
B
Its constituents are combined chemically.
C
Its constituents do not retain their individual properties.
In a compound, the constituent substances are combined chemically in a fixed ratio and cannot be separated by physical methods. Irrespective of the source or origin, the ratio of the masses of the combining elements remain constant, for example, water sourced from tap or rain has the same chemical formula, H2O.
Pure substances are defined as substances that are made of only one type of atom or only one type of molecule (a group of atoms bonded together). We know compounds are the physical aggregation of one type of molecules, hence compounds are pure substances.
- The constituents can be separated only by chemical or electrochemical reactions.
- Compounds have a variable composition.
- The composition of each new substance is always fixed.
- Elements react to form new compounds.
Answer (Detailed Solution Below)
Option 2 : Compounds have a variable composition.
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The incorrect statement is Compounds have a variable composition.
- Compounds have a fixed composition throughout the mass, Hence Option 2 is Not true.
- Properties of Compound
- A compound is a substance made up of two or more elements chemically combined in a fixed proportion by mass.
- A compound cannot be separated into its constituents by physical processes (It can only be separated into
its constituents by chemical processes). - The properties of a compound are entirely different from those of its constituents.
- Energy (in the form of heat, light, etc.) is usually given out or absorbed during the preparation of a compound.
- The composition of a compound is fixed, the constituents are present in a fixed proportion by mass.
- A compound has a definite formula.
- A compound has a fixed melting point, boiling point.
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