What is the smallest country in the world by land area?

Question 1: What is the smallest country in the world by land area?
Question 2: Which famous scientist is credited with discovering penicillin?
Question 3: In the world of literature, who wrote the novel "To Kill a Mockingbird"?
Question 4: Which planet in our solar system is known for its distinctive rings?
Question 5: In the popular TV series "Breaking Bad," what is the main character Walter White's pseudonym when he becomes a drug kingpin?