A _____ tinge is observed on a moist potassium iodide paper when it is kept in contact with $N O_{2}$ gas for a long time.

brown

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grey

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red

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violet

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Solution

The correct option is D violet
The white moist potassium iodide paper turns brown as soon as it comes in contact with nitrogen dioxide gas.
However, if it is kept in contact for a long time, they react with each to form iodine gas which results in a violet tinge on the paper.
The equation for the same can be written as:

$2 N O_{2} (g) + 2 K I (a q) \to 2 K N O_{2} (a q) + I_{2} (g)$

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