Read the given passage and fill in the blanks by choosing an appropriate option.
Metals have high densities except (i)__ which can even float on water. Metals are malleable and ductile (ii)___ are the most malleable and ductile metals. All metals conduct heat and electricity. (iii)___ is the best conductor while (iv)___ is a poor conductor.

Answer

C

Explanation

Na and K have low densities. Gold (Au) and silver (Ag) are the most malleable and ductile metals. Silver (Ag) is the best conductor while mercury (Hg) is a poor conductor.