Help with A-Level Chemistry question?

Help with A-Level Chemistry question?

The composition of a mixture of two solid sodium halides was investigated in two separate experiments. 

1.) When a large excess of chlorine gas was bubbled through a concentrated solution of the mixture, orange-brown fumes and a black precipitate were produced. 

2.) The solid mixture was weighed then dissolved in water and an excess of silver nitrate solution was added. The mass of the mixture of silver halide precipitates formed was obtained. After washing the mixture of precipitates with an excess of concentrated aqueous ammonia the mass of the final precipitate was determined. The masses enabled calculation of the percentage by mass of each halide ion present in the solid mixture to be determined. 

Write equations for each of the reactions occurring in these experiments? 

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