Q.

Acidic K2Cr2O7 turns green by

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a

CO

b

SO2

c

CO2

d

HCl

answer is C.

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Detailed Solution

.when the sulphur dioxide gas is passed in the acidified potassium dichromate then it yields chromium sulphate and water. - In the given reaction, the potassium dichromate is reduced to the chromium sulphate i.e. from +1 to +5 which is responsible for giving the green colour.

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