Question

Two of the metals, that cannot be stored either in air, or under water, are
magnesium and calcium
sodium and magnesium
calcium and potassium
potassium and sodium​

Answer 1

Hey mate the answer is potassium and sodium as these metals are highly reactive and should be stored in kerosene.

Answer 2

Answer:

Potassium and sodium because they are highly reactive metals and can react with air to produce flame. That's why they are kept under kerosene oil