Question

Which of the following is the correct use of potassium dichromate?

• A. It is used to catch drink and drive cases.
• B. It is used in leather industry
• C. It is used in volumetric analysis.
• D. All of the above.

Answer 1

The correct option is D All of the above.

$K_{2}C{r}_2{O}_7$ is an oxidizing agent for variety of reactions in laboratories and industry.
It is used in leather industry for chrome tanning by acting as a precursor for potassium chrome alum.
It is used in volumetric analysis.
It is used as a favourite oxidant in preparative organic chemistry.
Its uses for the bleaching of wool, cotton, silk and other textile fibres and for the decolourisation of oils are also dependent on its strong oxidising power.
One important application for potassium dichromate is in old police breath analyzer tests for the determination of drink and drive cases. When alcohol vapour makes contact with the orange dichromate-coated crystals, the colour changes from Cr (VI) orange to Cr (III) green.