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.
Pure substances contain only one kind of particles. Pure substances have the same composition throughout.
Substances that are made of only one type of atom or only one type of molecule are called pure substances. These substances have the same composition throughout. All elements and compounds are examples of pure substances. Tin, diamond, water, sugar and table salt pure substances.