Which of the the following statements are true for pure substance ?
(i) pure substance contain only one kind of particles
(ii) pure substance may be compounds or mixtures
(ii) pure substance 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)
