An organic compound (A) on heating produces two gases (B) and (C) and neutral oxide (D) which turns cobalt chloride paper pink. Gas (B) turns lime water milky and produces an acidic solution with wate

Question

An organic compound (A) on heating produces two gases (B) and (C) and neutral oxide (D) which turns cobalt chloride paper pink. Gas (B) turns lime water milky and produces an acidic solution with water. Gas (C) produces a poisonous gas (E) with chlorine gas, this gas with ammonia gives an organic compound (F) which on further reaction with (D) gives NH3 gas. Then, compounds (A) and (F) can be found as:

Prashant Kotian · Accepted Answer

Correct answer: A. Step 1: Separation of cations using H2S in dilute HCl depends on Group classification. Group II cations (such as Hg2+, Pb2+, Bi3+, Cu2+, Cd2+, Sn2+, As3+, Sb3+) precipitate as sulfides in acidic media because of their extremely low solubility products (Ksp). Step 2: Group III and IV cations (such as Al3+, Zn2+, Ni2+, Co2+, Mn2+) do not precipitate in dilute HCl with H2S because their sulfides require a higher sulfide ion concentration (basic/ammoniacal medium) to precipitate. Step 3: Since both Bi3+ and Sn2+ belong to Group II, they both precipitate as sulfides (Bi2S3 and SnS) under acidic H2S conditions, meaning they cannot be separated from each other using this reagent. Thus, option (a) is the correct choice.

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