Question

During the qualitative analysis of $SO_{3}^{-2}$ using dilute H2SO4, SO2 gas evolved which turns K2Cr2O7 solution (acidified H2SO4)

• A. Green
• B. Black
• C. Blue
• D. Red

Answer 1

Answer: (A)

Green

Answer 2

The correct answer is (A) : Green
Orange colour of dichromate solution (K2Cr2O7) converts to green (Cr3+).