Select the correct word from the list given in the bracket for each of the following statements.
A filter paper soaked in Potassium iodide turns__________ (brown/blue).

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Solution

A filter paper soaked in Potassium iodide turns brown.
This happens because when a filter paper is brought near the fumes of Nitric acid, the Iodine is liberated which changes the colour of the filter paper.
The chemical reaction that occurs between Nitric acid and Potassium iodide is as follows:
$\underset{(Potassium iodide)}{2 KI (s)} + \underset{(Nitric acid)}{4 {HNO}_{3} (aq)} \to \underset{(Potassium nitrate)}{2 {KNO}_{3} (s)} + 2 H_{2} O (l) + \underset{(Nitogen dioxide)}{2 {NO}_{2} (g)} + \underset{(Iodine)}{I_{2} (g)}$
Potassium iodide reacts with Nitric acid to form Potassium nitrate, Nitrogen dioxide, Iodine, and water.
Hence, a filter paper soaked in Potassium iodide turns brown.

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Select the correct word from the list given in the bracket for each of the following statements.A filter paper soaked in Potassium iodide turns__________ (brown/blue).

Select the correct word from the list given in the bracket for each of the following statements.
A filter paper soaked in Potassium iodide turns__________ (brown/blue).