Which of the following compounds contain(s) no covalent bond(s) ?
KCl, PH3, O2, B2H6, H2SO4
(1) KCl, H2SO4
(2) KCl
(3) KCl, B2H6
(4) KCl, B2H6, PH3


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KCl is an ionic compound it does not contain covalent bond.

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