Which species contain a coordinate bond

CHEMISTRY · Single correct · A Level · Chemistry · Bonding · Bonding

Problem

Which species contain a coordinate bond? I. HCHO\mathrm{HCHO} II. CO\mathrm{CO} III. H3O+\mathrm{H_3O^+} (1) I and II (2) I and III (3) II and III (4) I, II and III

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