Question

Which of the following statement 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.

Answer 1

Correct option is B. (i) and (iii)
Pure substances contain only one kind of particle and have the same composition throughout. Hence statements (i) and (iii) are true.

Pure substances may be elements or compounds. Mixtures are not pure substances, hence option (ii) is False.

Pure substances can be exemplified by all elements, including nickel. Hence option (iv) is false.

Therefore, option B is the correct answer for this question.