Chemistry
Grade-9
Easy

Question

What is the correct formula for the compound calcium carbide?

  1. CaC
  2. Ca2C
  3. CaC2
  4. Ca2C4

hintHint:

A compound always tends to be neutral.

The correct answer is: CaC2


    • 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.
    • Calcium has an oxidation state of +2, and carbon has an oxidation state of -1. To make the compound neutral one calcium atom and two carbon atoms are required. Hence, the correct formula for calcium carbide is CaC2.