Which of the following statement is false? a) Pure substances are further classified as elements and compounds. b) The components of a mixture do not retain their individual properties. c) A compound has a definite chemical composition. d) A mixture has a variable composition.
Answers
Explanation:
Correct option is
B
(i) and (iii)
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 particles.
Hence, the correct ans is (1) and (3).
Answer:
answer is a)a pure substances are further classified as elements and compounds and c also