Oxidizing and Reducing Agents Assessment

What is oxidation in terms of electron transfer?

• Gaining electrons

• Losing electrons

• No change in electrons

• Sharing electrons equally

A reducing agent:

• Takes electrons from other substances

• Makes oxidation happen

• Gives electrons to other substances

• Has no effect on electron transfer

Which statement about oxidizing agents is correct?

• They donate electrons

• They accept electrons from other substances

• They remain neutral in reactions

• They only work with metals

In a redox reaction, if element A is oxidized, it is:

• The oxidizing agent

• The reducing agent

• Neither an oxidizing nor reducing agent

• Both an oxidizing and reducing agent

When an element's oxidation number increases, it is:

• Being reduced

• Being oxidized

• Becoming a catalyst

• Remaining unchanged

In the reaction between calcium and chlorine (Ca + Cl₂ → CaCl₂), chlorine acts as:

• A catalyst

• A reducing agent

• An oxidizing agent

• A spectator ion

What happens to an oxidizing agent during a redox reaction?

• It remains unchanged

• It is oxidized

The oxidation number of hydrogen in H₂S is:

• +1

• -1

• 0

• -2

In the reaction between HNO₃ and H₂S, which compound is reduced?

• H₂O

• HNO₃

• H₂S

• SO₂

What happens to sulfur's oxidation number in H₂S when it's oxidized to S?

• Changes from -2 to 0

• Changes from 0 to -2

• Changes from +2 to 0

• Remains unchanged