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JEE CHEMISTRY MCQ: PRACTICAL CHEMISTRY
1
Medium
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Analyzing
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A mixture of chlorides of copper, cadmium, chromium, iron and aluminium was dissolved in water acidified with 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 solution hydroxide were added and filtered. The filtrate shall give test for
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Correct option: B
Sodium and aluminium
Option B (Sodium and aluminium) is correct because after precipitation of CuS and CdS by H2S, and boiling with HNO3, Al3+ forms [Al(OH)4]− in the presence of NH4Cl and NH4OH, which remains in the filtrate along with Na+.
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