Question

Metal which is soft and floats on water is _______ .

• A. aluminium
• B. copper
• C. lead
• D. potassium
• E. iron
• F. lithium

Answer 1

The correct option is F lithium

Lithium is lightest elemental metal nearly half as dense as water, so it floats on the surface and ultimately disappears, giving off hydrogen gas and forming a colourless solution of lithium hydroxide.

Hence, the correct option is $\text{F}$