Hydrogen peroxide is a strong oxidizing agent. In dilute solutions (3-6%), it is used as a mild antiseptic for minor cuts and as a bleaching agent for hair, teeth, and delicate materials like silk and wool. It decomposes into water and oxygen.
Explanation:
Potassium (K) is an alkali metal placed at the very top of the reactivity series. It reacts violently with water and air, requiring storage in kerosene. Gold, silver, and copper are noble or less reactive metals placed at the bottom of the series, often found in the free state.
Explanation:
Zinc is more reactive than iron (above in the reactivity series), so it can displace iron: Zn + FeSO₄ → ZnSO₄ + Fe. Silver, copper, and mercury are less reactive than iron and cannot displace it. The reactivity series predicts displacement: a more reactive metal displaces a less reactive one.
Explanation:
Acid rain is formed when sulfur dioxide (SO₂) and nitrogen oxides (NOx) emitted into the atmosphere (from burning fossil fuels) react with water, oxygen, and other chemicals to form sulfuric and nitric acids. These acids then fall to the ground as rain, damaging ecosystems.
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