CBSE Class 9 Answered

None of the given options are correct. 

Smoke, sand, moisture, and dew are not solid in liquid due to their different properties.

1. Smoke is a suspension of tiny particles. Which example of a solid in gas mixture
2. Sand is solid but not dissolved in water. Hence it cannot be a mixture.
3. Moisture refers to water vapour present in the air. Hence it is an example of liquid in gas.
4. Dew is condensed water vapour on a solid surface.

Therefore, none of these options are solids dissolved in a liquid.

Some examples of Solid-liquid mixtures are salt in water, sugar in water, etc.