HecptyAura
HecptyAura
06.04.2020 • 
English

1. Which statement best gives the central idea of the passage?
Oxygen is a flammable substance that can be dangerous to handle.
Oxygen is a highly abundant element but is difficult to obtain in pure form.
© Water is the most common compound containing oxygen.
0 Mercuric oxide is the compound usually used to obtain oxygen in the laboratory.

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