A mixture of chlorides of copper, cadmium, chromium, iron and aluminium was dissolved in water acidified with HCl and hydrogen sulphide gas was passed for sufficient time. It was filtered, boiled and a few drops of nitric acid were added while boiling. To this solution ammonium chloride and sodium hydroxide were added and filtered. The filtrate shall give test forA. sodium and ironB. sodium and aluminiumC. aluminium and ironD. sodium, iron , cadmium and aluminium

A mixture of chlorides of copper, cadmium, chromium, iron and aluminiu

1.	A mixture of chlorides of copper, cadmium, chromium, iron and aluminium was dissolved in water acidified with HCl and hydrogen sulphide gas was passed for sufficient time. It was filtered, boiled and a few drops of nitric acid were added while boiling. To this solution ammonium chloride and sodium hydroxide were added and filtered. The filtrate shall give test forA. sodium and ironB. sodium and aluminiumC. aluminium and ironD. sodium, iron , cadmium and aluminium
Answer» `Al(OH)_(3)` first formed will dissolve in NaOH NaOH +`Al(OH)_(3) to NaAlO_(2) +2H_(2)O` Therefore the filtrate will contain `NaAlO_(2)`. It can be tested for Na and Al.

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