Article Detail Which is smallest planet ? Answer: Mercury Similar Questions : 1. Which is the largest desert in India ? Answer: Thar (Rajasthan) 2. Which is the longest River in the World ? Answer: Nile 3. Which is the lightest metal ? Answer: Lithium 4. Which is the lightest gas ? Answer: Hydrogen 5. Which is Place of heaviest rainfall ? Answer: Mausinram (Meghalaya) 6. Which is Highest Award in India ? Answer: Bharat Ratna 7. Which is the largest gulf ? Answer: Gulf of Mexico Read more from - Longest and Largest