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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.

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)

  

Answers (1)

Answer: [B]

Solution. A pure substance consists of a single type of particles. Element or compound can be considered as pure form of matter. A cylinder of oxygen gas can be considered as pure substance. Milk cannot be considered as pure substance as it is a mixture of water fat protein etc. The composition or density of pure substance will be same throughout its distribution. Hence, the correct option is B.

 

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