More question?for discussion.
By the way, i will come into the blog and sum up all the answers and discussed with you on the derivation on the answer, after 1-2 weeks. What i wish to do is to see students participating and answering the questions.
3. An oxidisng agent was observed to turn from orange to green. It is most likely to be:
A) acidified potassium manganate (VII)
B) acidified potassium dichromate (VI)
C) maganese (IV) oxide
D) iron (III) chlorideAns: B
Hear from you…
The words “Orange to Green” and “Oxidizing Agent” have given us the thought
that Acidified Potassium Dichromate is the answer.
Acidified Potassium Dichromate is a common oxidizing agent which is used
commonly to test for the presence of reducing agent, whereby its colors changes
from orange [Cr2O7(2-)] to green [Cr3+].
Cr2O7 (2-) + 14H+ + 6e- —> 2Cr3+ + 7H2O
Cheers
Sean