What is the smallest country in Asia by land area?

Which of the following countries is an independent city-state with a land area of approximately 2.02 km²? What is the smallest country in South America by land area? What is the smallest country in Europe by land area, excluding Vatican City? What is the smallest country in Africa by land area? What is the smallest country in Oceania by land area? Which of the following countries is an independent city-state with a land area of approximately 61 km²? What is the smallest country in North America by land area? What is the second-smallest country in the world by area?