Synthesized answer
The provided passages do not explicitly state which questions remain unanswered in Plato's "Phaedo".
However, the passages do mention that the "Phaedo" depicts the death of Socrates and is Plato's fourth and last dialogue detailing the philosopher's final days, following "Euthyphro", "Apology", and "Crito" [1, 2]. The other dialogues mentioned touch upon Socrates' defense against charges [2], justice and injustice [2], and the social contract theory of government [2].
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
f the great dialogues of his middle period, along with the Republic and the Symposium. The Phaedo, which depicts the death of Socrates, is also Plato's fourth and last dialogue to detail the philosopher's final days, following Euthyphro, Apology, and Crito. Pages: 144 Snippet: The Phaedo, which depicts the death of Socrates, is also Plato's fourth and last dialogue to detail the philosopher's final days, following Euthyphro, Apology, and Crito.
Title: Apology, Crito and Phaedo of Socrates. by Socrates Description: The Apology is Plato's version of the speech given by Socrates as he defended himself in 399 BC against the charges of "corrupting the young, and by not believing in the gods in whom the city believes, but in other daimonia that are novel" . "Apology" here has its earlier meaning (now usually expressed by the word "apologia") of speaking in defense of a cause or of one's beliefs or actions. The general term apology, in context to literature, defends a world from attack (opposite of satire-which attacks the world). Crito…