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BITSAT 2013
Exam
BITSAT
Year
2013
Subject
Chemistry
Chapter
Practical Chemistry

BITSAT 2013 · Chemistry · Practical Chemistry

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

A mixture of chlorides of copper, cadmium, chromium, iron and aluminium was dissolved in water acidified with HCl\mathrm{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 filterate shall give test for.

Options

  1. ASodium and iron
  2. BSodium and aluminium
  3. CAluminium and iron
  4. DSodium, iron, cadmium and Al

Correct answer

B. Sodium and aluminium

Step-by-step solution

CuS and CdS are precipitated by H2S\mathrm{H}_{2} \mathrm{ S}. Hydroxide of Al will pass into the solution in the form of NaAlO2\mathrm{NaAlO}_{2} being amphoteric in nature. Hence filtrate will give test for sodium and aluminium.
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