Which of the following acts as solvent in ‘tincture of iodine’ solution?

Alcohol

The correct answer is option 2. Alcohol.

Out of the choices you listed, the solvent in a tincture of iodine solution is: Alcohol

Tincture of iodine is a solution made by dissolving iodine crystals in a mixture of alcohol and water. The alcohol acts as the primary solvent, while water helps dissolve some potassium iodide or sodium iodide (often added to improve solubility).

Here's a breakdown of the components:

Solute: Iodine \((I_2)\)

Solvent: Alcohol (usually ethanol)

Solubilizing agent (optional): Potassium iodide \((KI)\) or sodium iodide \((NaI)\)

Iodine itself is not very soluble in water. The alcohol provides a medium for the iodine to dissolve and distribute throughout the solution. The optional potassium iodide or sodium iodide can help improve the solubility of iodine in the alcohol-water mixture.