4. Which of the following is not a characteristic of a mixture?
(a) A mixture has fixed boiling and melting points.
(b) The constituents of a mixture are not present in a definite ratio.
(a) si
(c) There is no chemical reaction taking place amongst the constituents of a mixture
(d) The constituents of a mixture retain their original properties.
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(d) the constitution of a mixture retain their original properties
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