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Electrophilic Substitution Reactions of Haloarenes

Mixture of ...

Question

Mixture of $N a I (s) + K_{2} C r_{2} O_{7} (s) + c o n c . H_{2} S O_{4}$ when heated in a test tube dark vapours evolve___.

I_{2}

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N a_{2}

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H_{2}

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All the above

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Solution

The correct option is A $I_{2}$
Acidified potassium dichromate oxidizes sodium iodide to iodine.
Potassium dichromate is reduced to chromic sulphate. Liberated iodine turns the solution brown.
The reaction is as follows:
$K_{2} C r_{2} O_{7} + 6 N a I + 7 H_{2} S O_{4} \to C r_{2} (S O_{4})_{3} + 7 H_{2} O + 3 I_{2} + K_{2} S O_{4} + 3 N a_{2} S O_{4}$

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Similar questions

H_{2} S O_{4}

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

c o n c . H_{2} S O_{4}

N a O H

H_{2} O_{2}

N a C l

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

H_{2} S O_{4}

N a C l

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

H_{2} S O_{4}

{C u S O}_{4}

\to

{C u I}_{2}

{C u I}_{2}

\to

{C u}_{2} I_{2}

I_{2}

I_{2}

{N a}_{2} S_{2} O_{3} \to

{N a}_{2} S_{4} O_{6}

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