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Question

Which of the following statements is incorrect about pure substance?
I) It contains only one type of particle.
II) It has a constant composition throughout.
III) It has variable melting points and boiling points throughout.

A
Both II and III
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B
Only III
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C
Only I
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D
Both I and II
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Solution

The correct option is B Only III
Properties of a pure substance:
a) It contains only one type of particle.
b) It has a constant composition throughout.
c) It has constant properties throughout. Therefore, the melting point and boiling point remain constant throughout.

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