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

Question

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

KCl, B₂H₆

KCl, B₂H₆, PH₃

KCl, H₂SO₄

KCl

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