Chemistry
Grade-9
Easy

Question

What is the correct formula for aluminum sulfide?

  1. Al3S2
  2. Al2S
  3. AlS2
  4. Al2S3

hintHint:

A compound always tends to be neutral.

The correct answer is: Al2S3


    • In the chemical formula, metals are written first followed by non-metals.
    • The subscript tells about the number of atoms present in each.
    • A compound always tends to be neutral.
    • Aluminum has an oxidation state of +3, and sulfur has an oxidation state of -2. To make the compound neutral two aluminum atoms and three sulfur atoms are required. Hence, the correct formula for aluminum sulfide is Al2S3.