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JEE Advanced2014ChemistryRedox ReactionsActual

Consider the following list of reagents: Acidified K 2 C r 2 O 7 , alkaline K M n O 4 , C u S O 4 , H 2 O 2 , C l 2 , O 3 , F e C l 3 , H N O 3 and N a 2 S 2 O 3 . The total number of reagents that can oxidise aqueous iodide to iodine is

Correct answer

7

Step-by-step solution

K 2 C r 2 O 7 , C u S O 4 , H 2 O 2 , C l 2 , O 3 , F e C l 3 , H N O 3 K 2 C r 2 O 7 + 7 H 2 S O 4 + 6 K I → 4 K 2 S O 4 + C r 2 S O 4 3 + 3 I 2 + 7 H 2 O 2 C u S O 4 + 4 K I → C u 2 I 2 + I 2 + 2 K 2 S O 4 H 2 O 2 + 2 K I → I 2 + 2 K O H C l 2 + 2 K I → 2 K C l + I 2 O 3 + 2 K I + H 2 O → 2 K O H + I 2 + O 2 2 F e C l 3 + 2 K I → 2 F e C l 2 + I 2 + 2 K C l 8 H N O 3 + 6 K I → 6 K N O 3 + 2 N O + 4 H 2 O + 3 I 2 2 K M n O 4 + K I + H 2 O → K I O 3 + 2 M n O 2 + 2 K O H

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