Which of the following statements is/are correct?

A) Zinc and lead are more reactive elements than copper.

B) Zinc and lead are less reactive elements than copper.

C) An iron nail become yellow in colour when it is dipped in the copper sulphate solutions. 

The correct answer is Option 4.

Key Points

• Reactivity Series: Zinc is more reactive than copper, and lead is also more reactive than copper. This follows the order of reactivity in the metal reactivity series.
• Zinc Reactivity: Zinc can displace copper from its compounds due to its higher reactivity.
• Lead Reactivity: Lead, although less reactive than zinc, is still more reactive than copper.
• Iron and Copper Sulphate Reaction: An iron nail dipped in copper sulphate solution will turn brownish-red due to the deposition of copper, not yellow.

Additional Information

• Metal Reactivity Series: This series ranks metals from highest to lowest reactivity. Elements like potassium and sodium are at the top, while gold and platinum are at the bottom.
• Displacement Reactions: More reactive metals can displace less reactive metals from their compounds in aqueous solutions.
• Copper Sulphate Solution: It is a blue solution commonly used in school experiments to demonstrate displacement reactions.
• Iron and Copper Reaction: When iron reacts with copper sulphate, iron displaces copper, forming iron sulphate and copper metal, which deposits on the iron surface.
• Color Changes in Reactions: The color change in chemical reactions involving transition metals can often indicate the formation of different compounds or the deposition of metals.