Alloy

The problem asks for the name of the alloy formed by mixing mercury with another metal. Among the given options, the alloy formed by combining mercury with other metals is known as an Amalgam.

To understand this, remember that:

• Solder is typically an alloy used for joining metal parts together, primarily composed of lead and tin.
• Duralumin is an alloy primarily made from aluminum, with copper, manganese, and magnesium.
• Pewter is an alloy made mostly of tin, with antimony and copper.
• Amalgam, on the other hand, refers to any alloy of mercury with another metal. Dental amalgams, for example, are widely used in fillings and typically contain mercury mixed with silver, tin, and copper.

Therefore, the correct answer is Amalgam.