Your answer, "10th", is not correct.
The correct answer to
On which day of the fifth month of the nineteenth year of Nebuchadrezzar, did Nebuzaradan, captain of the guard, come?
is
7th
as shown by
2 Kings 25:8
which is
- KJV
- And in the fifth month, on the seventh day of the month, which is the nineteenth year of king Nebuchadnezzar king of Babylon, came Nebuzaradan, captain of the guard, a servant of the king of Babylon, unto Jerusalem:
- NIV
- On the seventh day of the fifth month, in the nineteenth year of Nebuchadnezzar king of Babylon, Nebuzaradan commander of the imperial guard, an official of the king of Babylon, came to Jerusalem.