Final substance in beaker A is a pure substance and the final substance in beaker B is a mixture. So the correct option is C.
What are mixtures?
According to the definitions of chemistry, a mixture is a substance in which the constituents or the component do not form any any of chemical relation. In a mixture, the components are physically mixed with each other.
The chemical properties or identities of the components are not modified when they form a mixture as there is no chemical reaction happening.
Since there is no chemical reaction taking place, the components of a mixture are easily separated by some physical methods. We know that air is a mixture of gases in which the component gases do not lose their properties.
Mixtures are either homologous or heterologous. Homologous mixtures have same properties and proportion of constituents throughout their mass and heterologous mixtures have different properties and proportion of their constituents.
Therefore, the correct option is C.
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