Which of the following is the most reactive metal?

Correct option is B

(b) Iron

Explanation:

Iron (Fe) is more reactive than lead, copper, and mercury. It readily reacts with oxygen and water, forming iron oxide (rust). In the reactivity series, iron is placed above these metals, indicating higher reactivity. The most reactive metals are alkali metals (like sodium and potassium), but among the given options, iron is the most reactive.

Key Points:

• Iron forms rust (Fe₂O₃·xH₂O) in moist air.
• Reactivity series ranks metals based on their tendency to lose electrons.
• Copper and mercury are less reactive and used in coins and electrical wiring.
• Lead has low reactivity and is used in batteries.
• Iron is extracted from hematite (Fe₂O₃) using a blast furnace.
• Galvanization (coating with zinc) prevents rusting of iron.

Analysis of Other Options:

• (a) Lead (Pb) – Less reactive, does not corrode easily.
• (c) Copper (Cu) – Very low reactivity, does not react with water.
• (d) Mercury (Hg) – Least reactive, exists as a liquid at room temperature.

Additional Information:

• Potassium (K) is one of the most reactive metals.
• Gold (Au) and platinum (Pt) are least reactive.
• Iron is an essential element in hemoglobin for oxygen transport in blood.