In the reaction 2FeCl₃ + SnCl₂ → 2FeCl₂ + SnCl₄, which substance is reduced?
A. FeCl₂
B. SnCl₂
C. FeCl₃
D. SnCl₄
Answer: Option C
Solution (By JKExamLibrary)
Fe in FeCl₃ goes from +3 to +2 in FeCl₂, gaining an electron – reduction. Sn in SnCl₂ goes from +2 to +4 in SnCl₄, losing electrons – oxidation. FeCl₃ is the oxidizing agent, SnCl₂ is the reducing agent.
Explanation:
Green chemistry aims to design products and processes that minimize the use and generation of hazardous substances. Using hydrogen peroxide (H2O2) for bleaching paper is an example of green chemistry because it breaks down into harmless water and oxygen, unlike chlorine which can produce toxic, persistent organochlorine byproducts.
Explanation:
Zinc blende (ZnS) is first concentrated by froth flotation, then roasted in excess air to convert it to ZnO: 2ZnS + 3O₂ → 2ZnO + 2SO₂. ZnO is then reduced with coke at high temperature (smelting) or dissolved in H₂SO₄ and electrolyzed. Roasting is typical for sulfide ores to remove sulfur as SO₂.
Explanation:
Radioactive decay is a first-order process because the rate of decay is proportional to the number of radioactive nuclei present. Half-life is constant, independent of initial amount.
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