Which among the following precious stones have most similar chemical composition?
1. Ruby
2. Sapphire
3. Emerald
Choose the correct option from the codes given below:

Answer: [B] Only 1 & 2

Ruby is mineral corundum, an Aluminium oxide (a-Al2O3) and so is sapphire. Emerald is Beryllium Aluminium cyclosilicate (Beryl). So 1 & 2 are closest to each other.

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