Oxidation Number

 1) which one of l and  is not likely to exist ?

2) how does ammonia react with AgN? Write it chemical reaction ?

3) give the disproportionation reaction of  

4) HYPOPHOSPHURUS acis is a good reducing agent . Justify with example 

5) give chemical equation in support of the statement that all bonds in P MOLECULE ARE NOT EQUIVALENT 

(i) Balance the following equations by oxidation number method:
(1) Cu + HNO3 → Cu (NO3)2 + NO2 + H2O)
(2) K2Cr2O7 + HCl → KCl + CrCl3 + H2O + Cl2
(ii) Give reasons for the following:
(1) HNO3 acts only as an oxidising agent while HNO2 can act both as a
reducing agent and an oxidising agent.
(2) Chlorine liberates iodine from KI solution.

How will you convert the following? (Give balanced equation.)
(1) Sodium acetate to methane

Find the oxidation number of:
(1) S in Na2S4 O6

2) S in