: 1) a) No color change will occur when litmus paper comes in contact with dry litmus paper.
b) A base turns red litmus to blue.
Ammonia solution turns red litmus to blue
When ammonium hydroxide is added to ferrous sulphate solution dull green coloured precipitate of ferrous hydroxide is formed.
FeSO4 +  2 NH4OH
Ferrous sulphate + Ammonium hydroxise
Fe (OH)2 + (NH4)2 SO4
Ferrous hydroxide + Ammonium sulphate

b.Aluminium chloride. 
b) When ammonium hydroxide is added to aluminium chloride solution a white gelatinous precipitate of aluminium hydroxide is formed.
AlCl3 + 3 NH4OH
Aluminium hydroxide + Ammonium hydroxide
 Al (OH)3 + 3 NH4Cl
Aluminium hydroxide + Ammonium chloride
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