Question: Which of the following compounds contain(s) no covalent bond(s)?]
$\mathrm{KCl}, \mathrm{PH}_{3}, \mathrm{O}_{2}, \mathrm{~B}_{2} \mathrm{H}_{6}, \mathrm{H}_{2} \mathrm{SO}_{4}$
$\mathrm{KCl}, \mathrm{H}_{2} \mathrm{SO}_{4}$
$\mathrm{KCl}$
$\mathrm{KCl}, \mathrm{B}_{2} \mathrm{H}_{6}$
$\mathrm{KCl}, \mathrm{B}_{2} \mathrm{H}_{6}, \mathrm{PH}_{3}$
Correct Option: , 2
Solution:
