Similarity between azide and chloride ions in ammonia solubility test

Steps:

• White precipitate forms as AgN3 with acidified AgNO3, mirroring AgCl formation for Cl-.
• Aqueous ammonia addition tests for complex formation and solubility.
• N3- similarity to Cl- implies AgN3 forms soluble [Ag(NH3)2]+ complex like AgCl.
• Thus, colorless solution predicts identical behavior for both precipitates.

Why A is correct:

• Cl- forms colorless [Ag(NH3)2]Cl solution; similarity defines AgN3 yielding colorless solution per coordination chemistry.

Why the others are wrong:

• B: Contradicts solubility; AgN3 dissolves, not remains.
• C: Describes Cl- directly, but prediction uses azide experiment via similarity.
• D: Ignores known AgCl dissolution in dilute ammonia.

Final answer: A