The colour changes observed when testing for reducing agents using acidified potassium heptaoxodichromate (VI) solution is?
A
yellow to purple
B
orange to green
C
green to orange
D
purple to yellow
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
Reducing agent like SO\(_2\).
Sulphur dioxide gas (SO\(_2\)) is bubbled through acidified potassium dichromate. The orange solution turns green.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4315)