Which one of the following statement is correct ?

Chemistry Chemical Analysis Previous Year Questions Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

From a mixed precipitate of AgCl and AgI, ammonia solution dissolves only AgCl.

Ferric ions gave a deep green precipitate on adding potassium ferrocyanide solution.

On boiling a solution having K + , Ca 2+ and HCO 3– ions we get a precipitate of K 2 Ca(CO 3 ) 2 .

Manganese salts give a violet borax bead test in the reducing flame .

Text Solution

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The correct answer is:

AgCl + 2NH 3 — → [Ag(NH 3 ) 2 ]Cl (colourless soluble complex); AgI + 2NH 3 — → No reaction

Fe 3+ + [Fe(CN) 6 ] 4– — → Fe 4 [Fe(CN) 6 ] 3 (prussian blue colouration or ppt.)

2KHCO 3 K 2 CO 3 + H 2 O + CO 2 ; Ca(HCO 3 ) 2 CaCO 3 + H 2 O + CO 2

In reducing flame the bead is colourless. It is violet in oxidising flame.

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