Both are separate questions....How to know what reaction is going to occur in each?
Joshi sir comment

In first case reactions involved areReduction of Fe+++,    Fe+++Fe++ Titration step,               6Fe+++K2Cr2O76Fe++++2Cr+++ By using titration reaction, solve the question   

 In second case reaction involved isAs4O6+4I3-As4O10+12I-Now solve

inform if any issue





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