Characteristics of the blue solution of sodium in liquid ammonia:

Paramagnetic:
- The blue solution of sodium in liquid ammonia is paramagnetic. This means that it is attracted to a magnetic field.
- This property arises due to the presence of unpaired electrons in the sodium atoms.
- In the blue solution, sodium atoms lose an electron to form sodium cations (Na+), and the electrons are solvated by the liquid ammonia molecules.
- The solvated electrons in the solution are responsible for its paramagnetic behavior.

Reducing in nature:
- The blue solution of sodium in liquid ammonia is reducing in nature.
- Reduction is a chemical process that involves the gain of electrons.
- In the blue solution, the solvated electrons can act as reducing agents and donate electrons to other species in a chemical reaction.
- This property makes the blue solution of sodium in liquid ammonia useful in various organic synthesis reactions.

Conducts electricity:
- The blue solution of sodium in liquid ammonia is able to conduct electricity.
- This is because the solvated electrons in the solution are mobile and can carry an electric current.
- The presence of mobile charges allows the blue solution to conduct electricity, similar to a metal.
- The conductivity of the solution can be measured by performing conductivity experiments using electrodes.

Summary:
- The blue solution of sodium in liquid ammonia is paramagnetic, reducing in nature, and conducts electricity.
- Its paramagnetic behavior is due to the presence of solvated electrons with unpaired spins.
- The reducing property of the solution arises from the solvated electrons' ability to donate electrons in chemical reactions.
- The conductivity of the blue solution is a result of the mobility of the solvated electrons, allowing them to carry an electric current.