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Nitrous Oxide

Consider the ...

Question

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 $N a_{2} S_{2} O_{3}$ .
Which of the given reagents can oxidise aqueous iodide to iodine?

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Solution

Seven reagents will oxidise iodide to iodine.
$K_{2} C r_{2} O_{7} + 7 H_{2} S O_{4} + 6 K I \to 4 K_{2} S O_{4} + C r_{2} (S O_{4})_{3} + 3 I_{2} + 7 H_{2} O$
$2 C u S O_{4} + K I \to C u_{2} I_{2} + I_{2} + 2 K_{2} S O_{4}$
$2 K I + H_{2} O_{2} \to 2 K O H + I_{2}$
$2 K I + C l_{2} \to 2 K C l + I_{2}$
$2 K I + O_{3} + H_{2} O \to 2 K O H + I_{2} + O_{2}$
$2 F e C l_{3} + 2 K I \to 2 F e C l_{2} + I_{2} + 2 K C l$
$8 H N O_{3} + 6 K I \to 6 K N O_{3} + 2 N O + 4 H_{2} O + 3 I_{2}$
$2 K M n O_{4} + K I + H_{2} O \to K I O_{3} + 2 M n O_{2} + 2 K O H$
$N a_{2} S_{2} O_{3}$ will not react with $K I .$

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K_{2} C r_{2} O_{7}

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Acidified K_{2} C r_{2} O_{7}, Alkanline 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}, a n d N a_{2} S_{2} O_{3}

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