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CBSE Class 11-science Answered

Please answer the following question.
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Asked by Balbir | 19 Jun, 2018, 06:36: PM
answered-by-expert Expert Answer
When there is a combination of Halogen (Cl2, Br2I2) with a halide (Cl-, Br-, I-) then only stronger oxidising and strong reducing agents are combined.
 
Halogens are oxidising agents with the order: Cl2> Br2>I2
whereas halides are reducing agents: Cl-< Br-< I- 
 
In option 1:
Cl- + I2 → I- + Cl2
In above reaction, Cl- is a weak R.A and I2 is also a weak O.A. HENCE NOT POSSIBLE
 
In option 3:
Br- + I2 → I- + Br2

In above reaction, Br- is a moderate R.A but I2 is a weak O.A. HENCE NOT POSSIBLE
 
In option 2:
I- + Cl2 →  Cl- + I2

In above reaction, I- is a strong R.A. and Cl2 is also a strong O.A. HENCE THIS REACTION IS POSSIBLE
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