Question

can any body tell me definition of oxidation and reduction​

Answer 1

$\large\dag\underline{ \underline \red{ \boldsymbol{ \:Question : -}}}$

• Define Oxidation and Reduction

$\large\dag\underline{ \underline \blue{ \boldsymbol{ \: Answer: -}}}$

$\large\bold{oxidation : - }$ if a substance gains oxygen (O2) and removes hydrogen during reaction it's called oxidation.

Example :-

• 2Mg + O2 ➡️ 2MgO

In this reaction Copper gains oxygen this is oxidation.

$\large\bold{Reduction : - }$ If a substance gains Hydrogen and loses oxygen it's called reduction.

Example : -

• CuO + H2 ➡️ Cu + H2O

In this reaction Copper loses oxgen this is said to be reduction.

≫MORE Information

Redox Reaction :- When one reactant gets oxidised and the other gets reduced is known as redox Reaction.

Example :-

• Cuo + H2 ➡️ Cu + H2O

In this reaction Copper oxide(CuO) loses oxygen and is being reduced. And Hydrogen gains oxygen and being oxidised.

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Answer 2

$\boxed{CH_4 + O_2 \rightarrow CO_2 + H_2O }}$Answer and Explanation:

$\diamond$ Oxidation and reduction are defined in different ways

$\diamond$ It can be defined based on :

1. Electrons
2. Hydrogen
3. Oxygen
4. Oxidation number

$\diamond$ $\huge \text{\boxed{\mathbb{OXIDATION}}}$

$\implies$ Based on electrons, oxidation is defined as the lose of electrons

      Eg: $\boxed{Zn \rightarrow Zn^{2+} + 2e^-}$

$\implies$ Zn loses 2 electrons and oxidises to Zn²⁺

$\implies$ Based on hydrogen, oxidation is defined as the lose of hydrogen

      Eg: $\boxed{CH_4 + O_2 \rightarrow CO_2 + H_2O }$

$\implies$ CH₄ loses hydrogen and oxidises to CO₂

$\implies$ Based on oxygen, oxidation is defined as the gain of oxygen

      Eg: $\boxed{CH_4 + O_2 \rightarrow CO_2 + H_2O }$

$\implies$ CH₄ gains oxygen and oxidises to CO₂

$\implies$ Based on oxidation number, oxidation is defined as increase in oxidation number

      Eg: $Al (0 - oxidation \ number) \rightarrow Al^{3+} (3 - oxidation \ number)$

$\diamond$ $\huge \text{\boxed{\mathbb{REDUCTION}}}$

$\implies$ Based on electrons, reduction is defined as the gain of electrons

      Eg: $\boxed{Cu^{2+} +2e^- \rightarrow Cu}$

$\implies$ Based on hydrogen, reduction is defined as the gain of hydrogen

      Eg: $\boxed{CH_4 + O_2 \rightarrow CO_2 + H_2O }$

$\implies$ O₂ gains hydrogen and is reduced to water

$\implies$ Based on oxygen, reduction is defined as the lose of oxygen

      Eg: $\boxed{CH_4 + O_2 \rightarrow CO_2 + H_2O }$

$\implies$ O₂ loses oxygen (1 oxygen atom) and is reduced to water

$\implies$ Based on oxidation number, reduction is defined as decrease in oxidation number

      Eg: $Cu^{2+} (2 - oxidation \ number) \rightarrow Cu (0 - oxidation \ number)$