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