Oxidation is de-electronation whereas reduction is electronation. Oxidants are the substances which oxidise others and reduced themselves. On the other hand reductants are the substances which reduce others and oxidised themselves. The oxidation number of an element in a compound decides its nature to act as oxidant or reductant. Oxidation-reduction occur simultaneously and the overal chemical change is called redox reaction. Redox reactions are of three types : (i) Intermolecular erdox reactions, (ii) Auto-redox or disproportionation reaction, and (iii) Intramolecular redox reactions. Which of the following show intramolecular redox change? (I) `2KClO_(3) rarr 2KCl+3O_(2)` (II) `(NH_(4))_(2)Cr_(2)O_(7) rarr N_(2)+Cr_(2)O_(3)+4H_(2)O` (III) `NH_(4)NO_(2) rarr N_(2)+2H_(2)O` (IV) `2Cu^(+) rarr Cu^(2+)+Cu`A. I,II,IIIB. I,IVC. II,IIID. II,IV

Oxidation is de-electronation whereas reduction is electronation. Oxid

1.	Oxidation is de-electronation whereas reduction is electronation. Oxidants are the substances which oxidise others and reduced themselves. On the other hand reductants are the substances which reduce others and oxidised themselves. The oxidation number of an element in a compound decides its nature to act as oxidant or reductant. Oxidation-reduction occur simultaneously and the overal chemical change is called redox reaction. Redox reactions are of three types : (i) Intermolecular erdox reactions, (ii) Auto-redox or disproportionation reaction, and (iii) Intramolecular redox reactions. Which of the following show intramolecular redox change? (I) `2KClO_(3) rarr 2KCl+3O_(2)` (II) `(NH_(4))_(2)Cr_(2)O_(7) rarr N_(2)+Cr_(2)O_(3)+4H_(2)O` (III) `NH_(4)NO_(2) rarr N_(2)+2H_(2)O` (IV) `2Cu^(+) rarr Cu^(2+)+Cu`A. I,II,IIIB. I,IVC. II,IIID. II,IV
Answer» Correct Answer - A It involves redox change of two species in a molecule.

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