Flashcards for JEE Chemistry - Redox Reactions Class 11

 Page 1


Redox Reactions
Flash cards
Page 2


Redox Reactions
Flash cards
Oxidation Reaction
(i) there is a ? in O or Electronegative element (S,Cl, F, Br, I)
(ii) ? of H or electropositive element.
(iii) any atom or ion gives e
–
(s) ie., DE-ELECTRONATION
(iv) Positive valency of element ?
(v) Negative valency of element ?
(vi) there is a ? in O.N.(Oxidation no.) of element.
Page 3


Redox Reactions
Flash cards
Oxidation Reaction
(i) there is a ? in O or Electronegative element (S,Cl, F, Br, I)
(ii) ? of H or electropositive element.
(iii) any atom or ion gives e
–
(s) ie., DE-ELECTRONATION
(iv) Positive valency of element ?
(v) Negative valency of element ?
(vi) there is a ? in O.N.(Oxidation no.) of element.
Reduction Reaction
(i) there is a ? in H or electropositive element
(ii) of O or electronegative element.
(iii) any atom or ion accepts e
–
(s) ie., ELECTRONATION
(iv) Positive valency of element ?
(v) Negative valency of element ?
(vi) There is a ? in O.N.(Oxidation no.) of element.
Page 4


Redox Reactions
Flash cards
Oxidation Reaction
(i) there is a ? in O or Electronegative element (S,Cl, F, Br, I)
(ii) ? of H or electropositive element.
(iii) any atom or ion gives e
–
(s) ie., DE-ELECTRONATION
(iv) Positive valency of element ?
(v) Negative valency of element ?
(vi) there is a ? in O.N.(Oxidation no.) of element.
Reduction Reaction
(i) there is a ? in H or electropositive element
(ii) of O or electronegative element.
(iii) any atom or ion accepts e
–
(s) ie., ELECTRONATION
(iv) Positive valency of element ?
(v) Negative valency of element ?
(vi) There is a ? in O.N.(Oxidation no.) of element.
Oxidation number (continued)
(a) Oxidation number for an element is defined as the 
arbitrary charge present on one atom when all other atoms 
bonded to it are removed as ions.
(b) When a bond between two identical atoms is broken, the 
bonded electrons are distributed equally between these 
atoms.
(c) Similarly when a bond between two different atoms is 
broken, the bonded electrons are assumed to be retained by 
the more electronegative atom.
Page 5


Redox Reactions
Flash cards
Oxidation Reaction
(i) there is a ? in O or Electronegative element (S,Cl, F, Br, I)
(ii) ? of H or electropositive element.
(iii) any atom or ion gives e
–
(s) ie., DE-ELECTRONATION
(iv) Positive valency of element ?
(v) Negative valency of element ?
(vi) there is a ? in O.N.(Oxidation no.) of element.
Reduction Reaction
(i) there is a ? in H or electropositive element
(ii) of O or electronegative element.
(iii) any atom or ion accepts e
–
(s) ie., ELECTRONATION
(iv) Positive valency of element ?
(v) Negative valency of element ?
(vi) There is a ? in O.N.(Oxidation no.) of element.
Oxidation number (continued)
(a) Oxidation number for an element is defined as the 
arbitrary charge present on one atom when all other atoms 
bonded to it are removed as ions.
(b) When a bond between two identical atoms is broken, the 
bonded electrons are distributed equally between these 
atoms.
(c) Similarly when a bond between two different atoms is 
broken, the bonded electrons are assumed to be retained by 
the more electronegative atom.
Oxidation number (continued)
(d) Rules for the determination of oxidation number
Oxidation number (abbreviated as O.N.) is determined as per 
the below mentioned rules : -
(i) In all hydrogen compound (except hydrides of very active 
metals such as lithium, sodium or calcium), O.N. of hydrogen 
is taken to be +1.
(ii) In all oxygen compounds (except hydrogen peroxide, 
super oxide and related compounds) the O.N. is taken to be –
2. The O.N. of oxygen in OF
2
is +2,
(iii) In compounds, the O.N. of fluorine is assigned to be –1. 
Since fluorine is the highest electronegative element, so its 
O.N. is always –1.
(iv) In compounds, the group I elements (Li, Na, K, Rb, Cs 
and Fr) have an O.N. of +1.