Which of the following represents a disproportionation reaction?
A. N2 + 3H2 -> 2NH3
B. 2H2O2 -> 2H2O + O2
C. Zn + CuSO4 -> ZnSO4 + Cu
D. CaCO3 -> CaO + CO2
Answer: Option B
Solution (By JKExamLibrary)
A disproportionation reaction is a specific type of redox reaction where the same element in a single substance is simultaneously oxidized and reduced. In the decomposition of hydrogen peroxide (H2O2), oxygen has an oxidation state of -1. It is reduced to -2 in H2O and oxidized to 0 in O2.
Explanation:
Rusting is a chemical change because iron reacts with oxygen and moisture to form a completely new chemical substance, hydrated iron(III) oxide (Fe₂O₃·xH₂O), which has different chemical properties from iron and cannot be easily reversed by simple physical means like heating or cooling.
Explanation:
CO₂ is the primary anthropogenic greenhouse gas from fossil fuel combustion. N₂, O₂ not IR active. Ammonia is not a major GHG. Methane, N₂O also contribute.
Explanation:
The long non-polar hydrocarbon tail is hydrophobic and dissolves in grease/oil. The ionic head (carboxylate) is hydrophilic and interacts with water. This dual nature enables micelle formation and cleaning.
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