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Matter

In the pure s...

Question

In the pure substance, the constituent particle have same _________.

A

physical nature

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B

chemical nature

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C

both a and b

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D

none of the above

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Solution

The correct option is C chemical nature
A pure substance is one that have single type of particles i.e. all particle have same chemical nature.For example:- sugar molecules.

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The constituent particles of a pure substance are different in their chemical nature.

Constituents of a pure substance cannot be easily separated by physical methods.

Q. Matter undergoes a change. The changes are of two types: Physical and chemical change.

A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same. Usually increasing the temperature or applying pressure or both bring about a physical change. On reversing the condition, that is reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible.

A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.

In a chemical change, the properties that change are :

Q. Matter undergoes a change. The changes are of two types : Physical and chemical change. A physical change is a change that involves only a change in the physical state of matter.
Its chemical properties remain the same. Usually increasing the temperature of applying pressure or both brings about a physical change. On reversing the condition, i.e., reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible. A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, the chemical and physical properties of the substance is formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance. When zinc carbonate is heated and cooled, the change(s) that are observed are :

Q. Which of the following statement(s) is/are false?
1. A pure substance is heterogeneous in nature.
2. The composition of a pure substance can be altered by any physical means.
3. A pure substance contains a fixed number of particles.

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