The addition of oxygen to a substance is called __________.

oxidation

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reduction

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synthesis

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none of these

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Solution

The correct option is A oxidation
Oxidation Reduction
i) Addition of oxygen
eg.: $2 M g + O_{2} \to 2 M g O$ i) Removal of oxygen
eg.: $C u O + C \to C u + C O$
ii) Removal of Hydrogen
e.g.: $H_{2} s + C l_{2} \to 2 H C l + S$ ii) Addition of Hydrogen
eg.: $S + H_{2} \to H_{2} S$
iii) Increase in positive charge
eg.: $F e^{2 +} \to F e^{3 +} + e^{-}$ iii) Decrease in positive charge
eg.: $F e^{3 +} + e \to F e^{2 +}$
iv) Increase in oxidation number
(+2) (+4)
$S n C l_{2} \to S n C l_{4}$ iv) Decrease in oxidation number
(+7) (+2)
$M n O_{4}^{-} \to M n^{2 +}$
v) Removal of electron
eg.: $S n^{2 +} \to S n^{4 +} + 2 e^{-}$ v) Addition of electron
eg.: $F e^{3 +} + e^{-} \to F e^{2 +}$

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Similar questions

Fill in the following blanks with suitable words :

(a) The addition of oxygen to a substance is called ........... whereas removal of oxygen is called .......

(b) The addition of hydrogen to a substance is called .......... whereas removal of hydrogen is called .........

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	Oxidation		Reduction
i)	Addition of oxygen eg.: $2 M g + O_{2} \to 2 M g O$	i)	Removal of oxygen eg.: $C u O + C \to C u + C O$
ii)	Removal of Hydrogen e.g.: $H_{2} s + C l_{2} \to 2 H C l + S$	ii)	Addition of Hydrogen eg.: $S + H_{2} \to H_{2} S$
iii)	Increase in positive charge eg.: $F e^{2 +} \to F e^{3 +} + e^{-}$	iii)	Decrease in positive charge eg.: $F e^{3 +} + e \to F e^{2 +}$
iv)	Increase in oxidation number (+2) (+4) $S n C l_{2} \to S n C l_{4}$	iv)	Decrease in oxidation number (+7) (+2) $M n O_{4}^{-} \to M n^{2 +}$
v)	Removal of electron eg.: $S n^{2 +} \to S n^{4 +} + 2 e^{-}$	v)	Addition of electron eg.: $F e^{3 +} + e^{-} \to F e^{2 +}$