Which among the following is / are the feature(s) shared by all Noble metals?
1. Semi-conductivity
2. Radioactivity
3. Resistance to corrosion and oxidation
4. Rare availability in Earth’s crust
Select the correct option from the codes given below:

Answer: [C] Only 3 & 4

The most important characteristic of Noble metals is resistance to corrosion and oxidation in moist air. The opposite are base metals. They tend to be precious, often due to the rarity in the Earth’s crust. Examples: ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, gold.

This question is a part of GKToday's Integrated IAS General Studies Module