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Question

Which of the following is a pure substance?

A
Sea water
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B
Minerals
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C
Common salt
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D
Soil
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Solution

The correct option is C Common salt
All the constituent particles of a pure substance are the same in their chemical nature. Pure substances have a uniform and definite composition throughout. Common salt is a pure substance because it consists of only sodium chloride, i.e., NaCl units.
Sea water, minerals and soil are mixtures as they are composed of different kinds of particles.
Hence, the correct answer is option (c).

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