Displayed formulae

1 mark · Normal

In displayed formulae, what is the usual number of bonds formed by an oxygen atom?

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Correct option: 2

Common mistakes: Choosing 1 (as for halogens); Choosing 4 (as for carbon)

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Marking points

B1 · 1 mark · Selects 2 as the correct number of bonds for oxygen.

Worked solution

Oxygen forms 2 bonds in most organic compounds—examples are O bonded to two H atoms (water) or to one carbon and one hydrogen (alcohols).