CH-1818
Oxidation and reduction
Chemistry · Secondary 4 · Medium · Oxidation and reduction
A student heats lead(II) oxide strongly in a stream of hydrogen gas. Which observation shows that hydrogen has reduced lead(II) oxide?
- The yellow solid turns grey and water droplets appear
- The grey solid turns yellow and water droplets disappear
- The yellow solid remains unchanged and gas bubbles form
- The grey solid melts to form a colourless liquid
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