Question

Two metals lighter than water are:

• A. $Li,Na$
• B. $Al,Mn$
• C. $Pb,Mg$
• D. $Co,Mn$

Answer 1

The correct option is A $Li,Na$

$Li$ and $Na$ both metals belong to the alkali metals.

They are soft metals and have low ionization enthalpy,

Lithium is lighest elemental metal nearly half as dense as water, so if floats on the surface and ultimately diasppears, giving off hydrogen gas and forming a colourless solution of lothium hydroxide.

Sodium is also lighter than water nad have a density of $0.971g/c{m}^3$,

hence, $Li$ and $Na$ both metals are lighter than water.

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