Which of the following metals is less reactive than silver?

Correct option is C

​The correct answer is (c) Au (Gold).

Correct Answer Explanation:

• Gold (Au) is less reactive than silver. It is one of the least reactive metals, meaning it doesn't tarnish or corrode easily.
• This is why gold is often used in making jewelry and coins because it maintains its appearance for a long period.
• Gold does not react readily with oxygen, water, or other substances, making it more stable and less reactive than silver.

Information about Other Options:

•  Hg (Mercury): Mercury is more reactive than silver. It can form amalgams (alloys) with many metals, including gold and silver, and reacts with metals like aluminum. Mercury is liquid at room temperature, and its reactivity with other elements and compounds makes it more reactive than silver.
•  Cu (Copper): Copper is more reactive than silver. It tarnishes when exposed to air and moisture, forming copper oxide. It also reacts with sulfur compounds to form copper sulfides. Copper is more reactive than silver, which is why copper wires and pipes develop patina over time.
• Fe (Iron): Iron is more reactive than silver. Iron oxidizes quickly when exposed to air and moisture, leading to rust formation (iron oxide). Iron reacts readily with oxygen and water, making it more reactive than silver.

Information Booster:

Key concepts in the reactivity series:

•  Most reactive metals like sodium, potassium, and calcium react vigorously with water.
•  Less reactive metals like gold, platinum, and silver do not react easily with water or air.

Applications of metals based on their reactivity:

• Gold and Platinum are used in jewelry and electronics due to their low reactivity.
•  Iron and Copper are commonly used in construction and electrical wiring but are more prone to corrosion.

Atomic Number:

1. Gold (Au): Atomic Number = 79
2. Mercury (Hg): Atomic Number = 80
3. Iron (Fe): Atomic Number = 26
4. Copper (Cu): Atomic Number = 29