An inorganic red coloured compound (A) on heating gives a compound (B) and a gas (C). (A) on treatme — Qualitative and Quantitative Analysis Chemistry Question
Question
An inorganic red coloured compound (A) on heating gives a compound (B) and a gas (C). (A) on treatment with dil. HNO3 gives compound (D), brown colour substance (E) and a neutral oxide (F). Compound (D) on warming gives off again gas (C). Then, (E) will be:
Answer: B
💡 Solution & Explanation
Red lead Pb3O4 (A) -Δ-> 6PbO (B) + O2 (C). Pb3O4 + 4HNO3 -> 2Pb(NO3)2 (D) + PbO2 (E, brown) + 2H2O (F). 2Pb(NO3)2 -Δ-> 2PbO + 4NO2 + O2 (C). Hence, E is PbO2.
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