Question

What is oxidation number of sulphur in $SO_3$?

• A. +3
• B. +4
• C. +6
• D. -3

Hint:

Group 16 elements (like Sulphur) have a maximum possible oxidation state of +6, which corresponds to the total number of valence electrons they possess in their outermost shell.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The sum of oxidation numbers in a neutral molecule must be zero. Oxygen typically has an oxidation number of $-2$.

Step 2: Formula Application:
Let the oxidation number of sulphur be $x$. $x + 3(-2) = 0$.

Step 3: Explanation:
$x - 6 = 0 \implies x = +6$. Sulphur is in its highest oxidation state in $SO_3$.

Step 4: Final Answer:
The oxidation number of sulphur is +6.