Chem easy Q~

Question

Study the following reactions.
a) CH4(g)+2O2(g) ---> CO2(g)+2H2O(l)
b) Pb(NO3)2(aq)+2NaBr(aq)---> PbBr2(s)+2NaNO3(aq)
c) 6FeSO4(aq)+3Cl2(g)----> 2Fe2(SO4)3(aq)+2FeCl3(aq)
In each case, state
i) whether the reaction is redox or not
ii) the formula of the oxidizing agent (if applicable)
iii) the formula of the reducing agent (if applicable)
iv) the name of the element which is oxidized (if applicable)

Answer 1

a) Oxidation number of C increases from -4 to +4, while oxidation number of O decreases from 0 to -2.
i) The reaction is redox.
ii) O2
iii) CH4
iv) carbon

b) There are no changes in oxidation number for all elements involved.
i) The reaction is NOT redox.
ii)-iv) no answers.

c) Oxidation number of Fe increases from +2 to +3, while oxidation number of Cl decreases from 0 to -1.
i) The reaction is redox.
ii) Cl2
iii) FeSO4
(iv) iron