Answer:
Mixtures
Explanation:
Mixtures are simply a physical combination of two or more substances. They can be separated based only by physical means, or by undergoing physical changes. A physical change alters a substance without changing its composition.
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Flammmability is a chemical change because it changes the composition of the object. the product is very different from the rectant.
Calcium carbonate will be formed which is insoluble in water.
The answer is a) K and CrO4 only.
