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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 mixture
(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)
    (ii) and (iii)
  • c)
    (i) and (iii)
  • d)
    (ii) and (iv)
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Which of the following statements are true for pure substances?(i) Pu...
Statement: Which of the following statements are true for pure substances?

Explanation:
Pure substances are substances that are made up of only one type of particle. These particles can be atoms or molecules.

(i) Pure substances contain only one kind of particles:
This statement is true. Pure substances consist of only one type of particle, whether it is an atom or a molecule. Examples of pure substances include elements like oxygen (O2) and compounds like water (H2O).

(ii) Pure substances may be compounds or mixtures:
This statement is false. Pure substances cannot be mixtures. A mixture is a combination of two or more substances, each maintaining its own chemical properties. Pure substances can only be compounds or elements. Compounds are made up of two or more elements chemically combined in a fixed ratio.

(iii) Pure substances have the same composition throughout:
This statement is true. Pure substances have a uniform and definite composition. This means that every sample of a pure substance will have the same proportion of its constituent particles.

(iv) Pure substances can be exemplified by all elements other than nickel:
This statement is false. Pure substances can be exemplified by all elements, including nickel. Elements are pure substances composed of only one type of atom. Nickel is an example of an element, so it can be considered a pure substance.

Therefore, the true statements for pure substances are (i) and (iii).

Correct answer: (c) (i) and (iii)
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Community Answer
Which of the following statements are true for pure substances?(i) Pu...
Characteristics of pure substance:-
A pure substance contains only one type of particles which can either be atoms or molecules or elements or compounds.
A pure substance cannot be separated into other kinds of matter by any physical process but a mixture can as they are impure substances because they contain more than one particles. Ex: salt solutions.
A pure substance has fixed composition as well as fixed melting and boiling points. Ex: salt.
Pure substances cannot be exemplified by all elements other than nickel because pure nickel is an element containing only one kind of particle.
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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 mixture(iii) Pure substances have the same composition throughout(iv) Pure substances can be exemplified by all elements other than nickela)(i) and (ii)b)(ii) and (iii)c)(i) and (iii)d)(ii) and (iv)Correct answer is option 'C'. Can you explain this answer?
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