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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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(b) (i) and (iii) 

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