
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Thus, potassium dichromate can be used as an oxidizing agent only for the reactions:

$$
2 \mathrm{Br}^{-} - 2 e^{-} = \mathrm{Br}_{2}
$$
and
$$
2 \mathrm{I}^{-} - 2 e^{-} = \mathrm{I}_{2}
$$

Present the answer in LaTex format: \boxed{Your answer}
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