Identify a solution which contains solid as solute and liquid as solvent.

In sea water, various salts (which are solids) are dissolved in water (which is a liquid). Thus, the solute is solid and the solvent is liquid.

Hydrogen in palladium is an example of a gas in a solid.

Gels are colloidal systems where a liquid is dispersed in a solid.

An amalgam of mercury with metals is an example of a liquid in a solid.

Answer: Sea water