Redoks Dan Elektrokimia

What happens to oxygen in an oxidation reaction?

• It is released.

• It is captured.

• It changes its oxidation state.

• It gains electrons.

What happens to the oxidation state of a substance during an oxidation reaction?

• It decreases.

• It increases.

• It remains unchanged.

• It becomes zero.

What happens to electrons in a reduction reaction?

• They are released.

• They are captured.

• Their number decreases.

• Their number increases.

Consider the reaction: MnO4- → Mn2+. What type of reaction is this?

• Oxidation, because the oxidation state increases.

• Reduction, because the oxidation state decreases.

• Oxidation, because electrons are released.

• Reduction, because oxygen is released.

What happens to a substance that undergoes oxidation?

• Its oxidation number decreases.

• It gains electrons.

• Its oxidation number increases.

• It loses oxygen.

In the reaction Mg + 2HCl → MgCl2 + H2, which substance is the oxidation product?

• Mg

• HCl

• MgCl2

• H2

Which of the following conditions indicates that a reaction is a redox reaction?

• There is no change in oxidation numbers.

• There is a free element present.

• Only reduction occurs.

• Only oxidation occurs.

In the reaction Mg + 2HCl → MgCl2 + H2, which substance acts as the reductant?

• Mg

• HCl

• MgCl2

• H2

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