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On heating, how many of the following compounds produce BOTH an acidic product AND a basic product simultaneously? LiNO3, CaCO3, NH4NO3, FeSO4, Mg(OH)2

1. 1
2. 2
3. 3
4. 4

Correct answer: 1

Solution

LiNO3 -> Li2O (basic) + NO2 (acidic) + O2: gives both acidic and basic products. CaCO3 -> CaO (basic) + CO2 (acidic): gives both. NH4NO3 -> N2O + H2O: only neutral products. FeSO4 -> Fe2O3 + SO2 + SO3: gives acidic oxides and basic oxide. Mg(OH)2 -> MgO + H2O: only basic oxide + neutral. Careful count: LiNO3, CaCO3, and FeSO4 give both acidic and basic products = 3.

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