Article Detail Which is the lightest gas ? Answer: Hydrogen Similar Questions : 1. Which is the biggest country in Area ? Answer: Russia 2. Which is the Densest populated State of India ? Answer: West Bengal 3. Which state is largest by Population ? Answer: Uttar Pradesh 4. Which is the Largest lake of the world ? Answer: Caspian Sea (371,000 sq km) 5. Which is Largest Dome in World ? Answer: St. Peter's Basilica (Rome) 6. Which is the largest Zoo in India ? Answer: Zoological Gardens, Alipur, Kolkata 7. Which is the largest epic in world ? Answer: Mahabharat Read more from - Longest and Largest