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In which option does only the solute state change while the solvent remains water?

Answer and explanation

Correct answer: Salt in water and oxygen in water

The relevant principle is to compare the solute and solvent in each pair. In salt water, salt is a solid solute; in oxygenated water, oxygen is a gaseous solute. In both cases, water remains the liquid solvent, so only the solute state changes. The other options do not keep water as the common solvent: brass and bronze are solid alloys, air and smoke are gas-containing mixtures, and D uses solid metallic solvents.

Related tags

Water-SolventSolute-StateSolution-ComparisonScienceClass 9Solute And SolventExploring Mixtures And Their SeparationClass 9 Mcq

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