A heterogeneous mixture is not uniform in composition. Hence, option C is correct.
A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.
This substance is not an element or compound, because different components could be observed in the substance. Â
A pure substance is made up of only one type of atom (element) or only one type of molecule (compound), mixtures and solutions are made from two or more types of pure substances.
For example, aluminium is an element and ammonia is a compound.
This substance is not a homogeneous mixture, because different samples of the substance appeared to have different proportions of the components.
Hence, this substance is a heterogeneous mixture.
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