Give the observation when potassium dichromate paper is brought near the mouth of the test tube having co2 in it
Answers
Answered by
0
Answer:
If sulfur dioxide gas is bubbled through acidified potassium dichromate solution, the orange solution turns green, indicating that Cr
2
O
7
2−
has been reduced to Cr
3+
.
Cr
2
O
7
2−
+2H
+
+3SO
2
→2Cr
3+
+H
2
O+3SO
4
2−
But CO
2
doesn't give this test as it cannot oxidise further, so it can not reduce dichromate solution.
Similar questions