An alloy is a metal composed of two or more elements, at least one of which is metallic. The two main categories of alloys are which two of the following: (a) alloids, (b) intermediate phases, (c) metal compounds, (d) phase solutions, and (e) solid solutions?

Option (b) and (e)

Explanation:

An alloy is a combination of two or more elements with at least one metal combined in such a controlled way so as to generate required properties like increased strength, reduction in corrosion, etc.

The major categories of alloys are:

1. Intermediate phases:

This is the phase where the property or the composition (chemical) of an alloy is somewhere in between that of 2 pure metals.

2. Solid solutions: It is an evenly formed mixture of substances in solid state. Where the solid solution may be complete or partial resulting in single and two or more than 2 phases respectively.