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Mixture of chlorides of copper, cadmium, chromium iron and aluminium was dissolved in water acidified with HCl and H2S gas was passed for a 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 would give test for:

Correct answer: B. Sodium and aluminium

  • A. Sodium and iron
  • B. Sodium and aluminium
  • C. Aluminium, iron and sodium
  • D. Sodium, iron, cadmium and aluminium

Explanation

Option B is correct. The process described involves the precipitation of Cu2+ and Cd2+ ions as sulfides when H2S is passed in the presence of HCl. These ions are removed by filtration. The addition of HNO3, NH4Cl, and NaOH to the boiled filtrate leads to the formation of Na2AlO2, which confirms the presence of sodium and aluminum ions in the solution. Iron and cadmium are not present in the filtrate as they form insoluble sulfides that are removed during the filtration step.

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About s-Block and p-Block Elements

The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.

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