Question

Which of the following statements does not explain the difference between valency and oxidation number?

• A. Valency of an element is a fixed quantity whereas oxidation number varies from compound to compound.
• B. Valency is a pure number whereas oxidation number has positive or negative value.
• C. Oxidation number and valency have fixed values.
• D. Valency and oxidation number can be represented for an element or a radical.

Answer 1

The correct option is C Oxidation number and valency have fixed values.

Oxidation number is not fixed value as it changes from compound to compound. Different groups in periodic table have fixed valency of all elements in a particular group.