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A mixture of chlorides of copper, cadmiu...

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 for

A

sodium and iron

B

sodium and aluminium

C

aluminium and iron

D

sodium, iron , cadmium and aluminium

Text Solution

Verified by Experts

`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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