Redox Reaction PPT Chemistry Class 11

 Page 1


REDOX  REACTION
Page 2


REDOX  REACTION
REDOX REACTION
• Chemical reactions which involves both 
oxidation as well as reduction process 
simultaneously, are known as redox reactions 
(‘red’) from reduction and ‘ox’ from oxidation)
• All these reactions are always accompanied 
by energy change in the form of heat, light or 
electricity
Page 3


REDOX  REACTION
REDOX REACTION
• Chemical reactions which involves both 
oxidation as well as reduction process 
simultaneously, are known as redox reactions 
(‘red’) from reduction and ‘ox’ from oxidation)
• All these reactions are always accompanied 
by energy change in the form of heat, light or 
electricity
Page 4


REDOX  REACTION
REDOX REACTION
• Chemical reactions which involves both 
oxidation as well as reduction process 
simultaneously, are known as redox reactions 
(‘red’) from reduction and ‘ox’ from oxidation)
• All these reactions are always accompanied 
by energy change in the form of heat, light or 
electricity
REDUCTANTS AND OXIDANTS
• Oxidant or oxidising agent is a chemical substance which can 
accept one or more electrons and causes oxidation of some 
other species. In other words, the oxidation number of 
oxidant decreases in a redox reaction
• Important Oxidants
Molecules of most electronegative elements such as O
2
, O
3
, 
halogens.
Compounds having element in its highest oxidation state e.g.,
K
2
Cr
2
O
7
, KMnO
4
, HCIO
4
, H
2
SO
4
, KCIO
3
, Ce(SO
4
)
2
,
Oxides of metals and non-metals such as MgO, CrO
3
, CO
2
, etc.
Page 5


REDOX  REACTION
REDOX REACTION
• Chemical reactions which involves both 
oxidation as well as reduction process 
simultaneously, are known as redox reactions 
(‘red’) from reduction and ‘ox’ from oxidation)
• All these reactions are always accompanied 
by energy change in the form of heat, light or 
electricity
REDUCTANTS AND OXIDANTS
• Oxidant or oxidising agent is a chemical substance which can 
accept one or more electrons and causes oxidation of some 
other species. In other words, the oxidation number of 
oxidant decreases in a redox reaction
• Important Oxidants
Molecules of most electronegative elements such as O
2
, O
3
, 
halogens.
Compounds having element in its highest oxidation state e.g.,
K
2
Cr
2
O
7
, KMnO
4
, HCIO
4
, H
2
SO
4
, KCIO
3
, Ce(SO
4
)
2
,
Oxides of metals and non-metals such as MgO, CrO
3
, CO
2
, etc.
REDUCTANT OR REDUCING AGENT
• Reductant or reducing agent is a chemical 
substance which can give one or more 
electrons and causes reduction of some other 
species. In other words, the oxidation number 
of reductant increases in a redox reaction.
• Important Reductants
All metals such as Na, AI, Zn, etc., and some 
non – metals, e.g., C, S. P , H
2
, etc.
Metallic hydrides like NaH, LiH. KH, CaH
2
etc.