Question

Which of the following is the most active metal?

• A. Lithium
• B. Sodium
• C. Potassium
• D. Rubidium

Answer 1

The correct option is D Rubidium

Most of the active metals are so reactive that they readily combine with $O_2$ and $H_{2}O$. These metals are found in the group I A and II A of the periodic table. As all the given options belong to the same group and the activity increases down the group. So Rubidium is the most active metal.