Question

Which of the following statement is correct?
(1) A pure substance must contain only one
type of atom.
(2) A mixture containing two compounds
must be hetergeneous.
(3) A heterogeneous mixture must contain at
least three elements.
(4) A homogeneous mixture must be
uniform.
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Answer 1

(1) A pure substance must contain only one type of atom.

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Good Day !!

Answer 2

1.pure substance must contain only one type of atoms