a.

Fractional crystallization in acid solution

b.

Dissolution in sodium hydroxide and filtration

c.

Extraction with concentrated ammonia and reprecipitation

d.

Electrolysis of molten mixture

a.

Hydrolysis

b.

Oxidizing

c.

Polymeriazation

d.

Reduction

a.

Sodium dioxonitrate(III) and ammonium chloride

b.

Sodium trioxinitrate(V) and ammonium chloride

c.

Sodium chloride and ammonium trioxonitrate(V)

d.

Sodium chloride and ammonium diozonitrate(III)