Question

An amorphous white salt on strong heating gave a gas which turns lime water milky and a residue is left which turned yellow when hot and white when cold. The residue is dissolved in dil. Sulphuric acid by heating to form a clear solution. To this solution is then added sodium hydroxide solution slowly when a white ppt is first formed which dissolved completely on excess of sodium hydroxide.Based on this answer the following questions: [5] (i) Name the cation and anion present in the amorphous white salt. (ii) Name the residue formed. (iii) Write the chemical equation between the residue and dil. Sulphuric acid. (iv) Identify the white ppt and give the chemical equation when the precipitate dissolved in excess of ammonia solution.

Answer 1

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