ATTEMPT ALL QUESTIONS 1 What is the oxidation number of chromiumin the ionic compound ammonium
dichromate, (NH.):Cr:0,2
2) What are the original and final oxidation numbersfor ironin the smelting of iron
from iron oxide? Fe:O-(s) + 300(g) 2Fe(s) + 300:19)
3)Methanol fuel cells use the following reaction. How many electrons are
transferred in this redox reaction as written?
2CH. OH + 30.In 200 + 3H2O
4) Cobalt is one of many metals that can be oxidized by nitric acid Balance the
following the reaction. How many electrons are transferred, and what would be the
coefficient for H0 in the balanced reaction?
Do + NO..+ Hon NO + H20+ 00..
5)Which substance is the reducing agent in the following reaction
4H.(aq) + 201(aq) + Mno:(s) n Cl:(9) + Mn.(aq) + 2H.00)?​