MHT CET202014 Oct 2020Morning ShiftChemistryRedox ReactionsActual

When SO ₂ is passed through acidified K ₂ Cr ₂ 0 , the process that takes place is

Options

Athe solution turns blue
Bthe solution is decolourised
CSO ₂ is reduced
Dgreen Cr ₂ ( SO ₄ )₃ is formed

Correct answer

D. green Cr ₂ ( SO ₄ )₃ is formed

Step-by-step solution

When SO ₂ is passed through acidified K ₂ Cr ₂ O ₇ solution. SO ₂ gas turns acidified potassium dichromate solution from orange to green reduced chromium +4 to +3 . K ₂ Cr ₂ O ₇+2 H ₂ SO ₄+3 SO ₂ 2 Cr ₂ ( SO ₄ )₃+ K ₂ SO ₄+ H ₂ O

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