Q. Which of the following statements about Osmium are correct?

1. It is the densest naturally occurring element.
2. It is used in fountain pen tips and electrical contacts.
3. It is more abundant in Earth's crust than silver.
4. It is part of the platinum group metals.

Select the correct answer using the codes below:
Answer: 1, 2, and 4 only
Notes: Osmium is the densest element (about 22.6 g/cm³), used in fountain pen tips and electrical contacts, and is a member of the platinum group metals. However, it is rarer than silver in Earth's crust. Therefore, only statements 1, 2, and 4 are correct.