NCERT Class XI Chemistry Redox Reactions Solutions
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Question : 15
Total: 30
Justify giving reactions that among halogens, fluorine is the best oxidant and among hydrohalic compounds, hydroiodic acid is the best reductant.
Solution:
The halogens (X 2
Fluorine is the strongest oxidising agent (oxidant) because it can liberate the other halogens from their respective compounds. For example,
2 K C l + F 2 2 K F + C l 2
2 K B r + F 2 2 K F + B r 2
2 K I + F 2 2 K F + I 2
Among halogen acids (HX), the HI is the strongest reducing agent or reductant because it has minimum bond dissociation energy.
( k J m o l – 1 )
The iodination of methane is of reversible nature because HI produced in the reaction being a reducing agent converts Iodomethane back to methane.
C H 4 + I 2 C H 3 I + H I
C H 3 I + H I C H 4 + I 2
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Net reaction :C H 4 + I 2 C H 3 I + H I
Fluorine is the strongest oxidising agent (oxidant) because it can liberate the other halogens from their respective compounds. For example,
Among halogen acids (HX), the HI is the strongest reducing agent or reductant because it has minimum bond dissociation energy.
The iodination of methane is of reversible nature because HI produced in the reaction being a reducing agent converts Iodomethane back to methane.
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Net reaction :
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