JEE MAIN - Chemistry (2024 - 31st January Evening Shift - No. 24)
In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is $$(+)$$ _________.
Answer
6
Explanation
$$\begin{aligned} & \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7(\mathrm{~s})+4 \mathrm{KCl}(\mathrm{s})+6 \mathrm{H}_2 \mathrm{SO}_4 \text { (conc.) } \\ & \rightarrow 2 \mathrm{CrO}_2 \mathrm{Cl}_2(\mathrm{~g})+6 \mathrm{KHSO}_4+3 \mathrm{H}_2 \mathrm{O} \end{aligned}$$
This reaction is called chromyl chloride test.
Here oxidation state of $$\mathrm{Cr}$$ is +6.
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