Depending upon the physical states of the solute and the solvent, the solutions can be classified into the following types:

Out of these nine types of solutions, three solutions, namely solid in liquid, liquid in liquid,and gas in liquidare very common. In all these three types of solutions, liquid acts as a solvent.

The solutions in which water is the solvent are called aqueous solutionswhile those in which the solvent is other than water are called non-aqueous solutions. The common non-aqueous solvents are ether, benzene, carbon tetrachloride, etc.

What is an alloy of copper and zinc called?

Brass

The answer is 3. Brass.

Brass is an alloy of copper and zinc, with a composition of typically 60-80% copper and 20-40% zinc. Brass is a yellow-colored metal with good ductility, machinability, and corrosion resistance. It is used in a variety of applications, including musical instruments, jewelry, and electrical components.

Bronze is an alloy of copper and tin, with a composition of typically 85-95% copper and 5-15% tin. Bronze is a reddish-brown metal with good strength, hardness, and corrosion resistance. It is used in a variety of applications, including coins, statues, and musical instruments.

German silver is an alloy of copper, nickel, and zinc, with a composition of typically 50-55% copper, 25-30% nickel, and 15-20% zinc. German silver is a silver-colored metal with good strength, hardness, and corrosion resistance. It is used in a variety of applications, including jewelry, utensils, and electrical components.

Solder is an alloy of tin and lead, with a composition of typically 60-70% tin and 30-40% lead. Solder is a soft, silvery-white metal that is used to join metal objects together.

Therefore, the alloy of copper and zinc is called brass.