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Question 2 of 13

The set of lettered choices below refers to multiple questions. Select the one lettered choice that best fits each statement or answers each question. A choice may be used once, more than once, or not at all in each set.

Electrolysis of water to form hydrogen and oxygen gases

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Precipitation

Correct Answer:

No

Oxidation-reduction

Correct Answer:

Yes

Distillation

Correct Answer:

No

Hydration

Correct Answer:

No

Condensation

Correct Answer:

No

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The chemical equation for this reaction is
$2 H_{2} O (l) \to 2 H_{2} (g) + O_{2} (g)$ .

Note that the oxidation number of hydrogen changes from $+ 1$ to $0$ , and the oxidation number of oxygen changes from $- 2$ to $0$ . Hydrogen gains electrons and oxygen loses electrons. This is an oxidation-reduction reaction.

Question Difficulty:

medium

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Subject Test Chemistry

Question 2 of 13

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