When SO2 is passed through acidified K2 Cr2 O7 solution (a) The solution is decolourised (b) The

step 1 When sulfur dioxide is passed through acidified potassium dichromate solution, options are the s

When SO2 is passed through acidified K2 Cr2 O7 solution (a)...

When $\mathrm{SO}_{2}$ is passed through acidified $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ solution
(a) The solution is decolourised
(b) The solution is turned blue
(c) Green $\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}$ is formed
(d) $\mathrm{SO}_{2}$ is reduced

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Key Concepts

Redox Reactions

These reactions involve the transfer of electrons between chemical species, where one species is oxidized (loses electrons) and another is reduced (gains electrons). Understanding redox processes is essential for analyzing how reducing agents (such as sulfur dioxide) interact with oxidizing agents (such as acidified potassium dichromate).

Oxidizing Agents

Oxidizing agents are substances that accept electrons in a redox reaction, leading to their own reduction. In acidic media, compounds like potassium dichromate are strong oxidizers that facilitate electron transfer, resulting in notable changes in the oxidation state and color of the involved species.

Acidic Medium Effects

The presence of an acid in a redox reaction helps stabilize certain ions and promotes electron transfer. Acidified conditions are often critical in ensuring that oxidizing agents such as dichromate ions maintain their reactivity, enabling the efficient oxidation of reducing agents like sulfur dioxide.

Indicator Color Changes

Color changes are commonly used as indicators of chemical reactions, particularly in redox processes. When an oxidizing agent is reduced, its characteristic color often fades or transforms, providing a visual cue that a reaction has occurred.

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