Q. Which of the following elements are found in abundance on the Moon?

1. Oxygen
2. Sodium
3. Silicon
4. Titanium

Select the correct answer using the codes given below:
Answer: Only 1, 3 & 4
Notes: Oxygen is the most abundant element on the Moon (about 42%), with other major elements including silicon and titanium. Sodium is present, but in much lower quantities compared to these elements and is considered a volatile element. Major lunar surface elements: oxygen, silicon, magnesium, calcium, iron, and titanium; sodium is significantly depleted.