Question

Which is the most basic oxide?

• A. SnO$_2$
• B. K$_2$O
• C. CuO
• D. FeO

Hint:

Alkali metal oxides are strongest bases in periodic table.

Answer 1

The Correct Option is B

Step 1: Basic character of oxides increases down a group and is highest for alkali metal oxides.
Step 2: Identify families: - SnO$_2$ – oxide of p-block metal with acidic nature. - CuO, FeO – transition metal oxides, weakly basic/amphoteric. - K$_2$O – alkali metal oxide, strongly ionic and highly basic.
Step 3: Therefore K$_2$O shows maximum basicity. Hence → (B).