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Question 1
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)
(d) (ii) and (iii)

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Solution

The answer is (b).
A pure substance is one which is made up of only one kind of atoms or molecules. They have the same composition throughout.

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Q. Which of the following statements are true for pure substances ?
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(ii) pure substances may be compounds or mixtures
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Q. Question 8
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