Question

State which of the following are reduction reaction and which of them are oxidation....

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Answer 1

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Oxidation happens when:

electron is lost

oxygen is added

electronegative element is added

hydrogen is removed

Reduction happens when:

Electron is added

oxygen is removed

electropositive element is added

hydrogen is added

1. Pb lost 2 electrons, so, oxidation has taken place

2. one electron is lost from iron, so, oxidation has taken place

3. The element A has gained one electron, so, reduction has taken place

4. Copper lost 2 electrons, so, oxidation has taken place

Answer 2

In Oxidation,

• electron is lost ( + charge for the electron)

• oxygen is added  (O)

• electronegative element is added

• hydrogen is removed  (H)

In Reduction,

• electron is added  ( - charge for the electron)

• oxygen is removed

• electropositive element is added

• hydrogen is added

In the first reaction,

• Pb lost 2 electrons and became Pb²⁺

• ∴ oxidation takes place  here.

In the second reaction,

• Fe²⁺ lost 1 electron and became Fe³⁺

• ∴ oxidation has taken place

In the third reaction,

• A³⁺ gained 1 electron and became A²⁺

• ∴ reduction has taken place

In the fourth reaction,

• Cu lost 2 electrons and became Cu²⁺

• ∴ oxidation has taken place