Which of the following statements are true for pure substances?
(i) They contain only one kind of particles.
(ii) They can be compounds or mixtures.
(iii) They have the same composition throughout the substance.
(iv) They are formed by the physical combination of substances.

(ii) and (iii)

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(i) and (ii)

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(iii) and (iv)

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(i) and (iii)

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Solution

The correct option is D (i) and (iii)
Pure substances are made up of only one kind particles. They have the same composition throughout the sample. They cannot be further broken down into simpler substances.
Elements and compounds are pure substances. Whereas mixtures cannot be considered as pure, since they are formed by the physical combination of substances.

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Q. Which of the following statements are true for pure substances ?
(i) pure substances contain only one kind of particles
(ii) pure substances may be compounds or mixtures
(iii) pure substances have the same composition throughout
(iv) pure substances can be exemplified by all elements other than nickel

(a) (i) and (ii)
(b) (i) and (iii)
(c) (iii) and (iv)
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1. A pure substance is heterogeneous in nature.
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Question 8
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Which of the following statements are true for pure substances? (i) They contain only one kind of particles. (ii) They can be compounds or mixtures. (iii) They have the same composition throughout the substance. (iv) They are formed by the physical combination of substances.

Which of the following statements are true for pure substances?
(i) They contain only one kind of particles.
(ii) They can be compounds or mixtures.
(iii) They have the same composition throughout the substance.
(iv) They are formed by the physical combination of substances.