How many hydrogen atoms does a molecule of calcium hydroxide contain?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Two.
A molecule of calcium hydroxide has the chemical formula Ca(OH)₂. This formula indicates that each molecule contains two hydroxide (OH) groups.
Each hydroxide group has one hydrogen atom, so:
-
Number of hydrogen atoms per molecule = 2 (from two OH groups)
Therefore, a molecule of calcium hydroxide contains 2 hydrogen atoms.