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Question

A on reaction with dil.H2SO4 gives a colourless pungent gas that can turn Cr2O2−7/H+green. Green colour is due to formation of :

A
CrO24
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B
Cr3+
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C
CrO3
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D
CrO2Cl2
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Solution

The correct option is B Cr3+
Pungent gas is SO2.
It reduces potassium dichromate to green coloured chromium sulphate (Cr2(SO4)3)
K2Cr2O7+2H++3SO2(Cr2(SO4)3)(green)+5H2O+2K+. Thus, the green colour is due to formation of Cr(III) ion.

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